Boat porpoising motor height. According to MarinePartsMan Problem: Bo...

Boat porpoising motor height. According to MarinePartsMan Problem: Boat is porpoising in flat water, motor appears low in water Renegade prop, Evinrude 62# TM, Lowrance 1240 indash The longer the righting arm the higher the righting moment, or the force pushing the boat upright 2 FXR Series ; When the boat is on plane and the prop shaft is parallel … Step 1 Boat could have had better rod storage but : overall a good boat Mike I don't think motor height will change it The boat is podded, tunneled, Lifted transom, and a breakaway plate Then, once engine height is set right 2017 ETEC 150ho G1 My issue at hand is the boat starts loping at 63-65 plus mph, especially on smooth water Try both raising the motor … To me, if you give up trim angle, you give up speed and efficiency and the limiting factor on trim angle should be motor slip, not porpoising Additionally, having less drag is a telltale sign that the motor is too high because the motor isn’t underwater enough Motor is mounted in highest position and runs perfectly with water pressure and engine temps The boat handles a little better, but everything else stayed the same, except there's a little bore boat out of the water Raising the engine can provide several advantages: Reduced lower unit drag, thus increased speed (approximately one MPH per inch in the 60-80 MPH range) Its not that difficult to lift the engine height yourself with a couple of mates Trying to go any faster than that will just increase the bow and stern waves There are several things that can cause this motor height is one a hull with no flat running area is Porpoising is a weight balance and prop issue, at low speeds move as much weight back to the rear as you can The cav plate is currently 1/2 inch below the bottom I had six people in the boat and had to trim it all the way down to keep it from porpoising Trimming it too low though will result in other problems The boat has a 200 HP Suzuki engine 117 My plan is to go up two holes which judging by past experience should put my AV plate just above the water at speed The VBDP® incorporates the same design approach as documented in the Secrets of Tunnel Boat Design book (©1982-2018) 31 Related Question Answers Found What is chine on a boat? Pro seat, trolling motor, (2) graphs and lil' old me round out the front Still I read her to be a bit heavy in the arse Where do I begin to get this porpoising stopped? Is it balance ,motor thrust angle, or Plus, they can stop a boat porpoising – i The further down an outboard is mounted will cause porpoising as well, I had to play with motor height until I found the sweet spot 3 -Select- Wood Aluminum Fiberglass Position your outboard motor bracket, with the stick taped Raising the prop shaft higher will shift the Dynamic CofG forward and reduce trim angle I'm replacing the tilt assist on the motor and have an opportunity to change its height Length: 36' I seem to have to trim the motor in almost all the way to get the nose down to improve the ride is mildly choppy water How do you know if your outboard is too high? Recently had some mods done to my motor and am trying to gain some answers on proper transom height However once you get it raise, I'd definitely see what it does since you have it Cavitation plate has nothing to do with porpoising Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat Boat Information The motor is running great on non-ethyl but will only reach 5000 rpm wot @ 32mph/gps The center tube is a full length 30" PTX toon Your boat is porpoising because it is running good and the hull is making and breaking suction with the water 5 m side console tinny with a 60 fourstroke When you raise the motor on your Jon boat you move the thrust line higher which will, in turn, force the bow of the boat down into the water This old 31 Outboard Propeller Sizing Form ETA: And if you're wondering That usually happens when the boat goes to plane and the motor is trimmed too high, which could come from excessive motor weight, wrong motor mount height, or an incorrect trim gauge reading Or, try moving some weight forward if the boat is aft loaded I started off by lifting the motor up from the previous position and using the same prop (4 blade 24 pitch), that gave me around 300 more revs but the boat was way to unstable, so dropped it down again Boats with inset or "key slot" transoms will most likely need a medium to keep the plate from coming in contact with the sponsons while turning Engine height Set to the optimum level can really transform a boat’s performance, so it is seriously something you to address and get right All of the rest of the boat is rotated out of the water should take 10 mins My boat (Key West 1720) has a notch in the transom, and redirects spray up at the motor, exacerbating the spray issue Adjust the motor position The 20' boat really wants to go with the 200hp on the back but unfortunately sometimes I'll have to cruise in the 20-30 mph range and thats when I need the porpoising to to be under control, hopefully trimming all the way in and getting more comfortable with this particular boat will solve this 45" from the transom Balance point is exactly at 30%, or 9 Raising the jack plate to maximum height as your take off allows the boat to jump on plane quicker I have my strut at a level angle as possible by eyeing it And when u put the boat on a flat table the bottom of the strut is about 1 Another benefit has to do to with motor height The bow wanting to go sky high getting on plane can also be a symptom I think it is a new model for 2013 THE SHAFT LENGTH IS NOT FROM THE BOTTOM OF THE POWERHEAD ALL THE WAY TO THE BOTTOM OF THE SKEG, THAT MEASUREMENT IS USELESS! To use this method of finding horsepower your boat must be: 13 feet or less in length I have a used 1986 stratos bass boat with a 2001 150 hp Johnson motor 5mm from level with the pads in the rear or the table Then I may (or may not) play around with engine height Upon planing it immediately starts to porpoise, getting worse and worse tighten all 4 engine nuts and bolts Recommendations for electric trolling motor The Large plate is typically installed on 115 HP motors and up Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising Making changes to your motor height, engine setback, and propeller can also reduce the tendency to porpoise A boat can porpoise because the weight in the boat is disproportionate between the bow and the stern Some outboards may specify ideal angles in the owner's manual Originally Posted by tmd11111 This is my first bracketed boat so I'm not Porpoising easily with very little trim is often a symptom of motors being low some boats do this To measure pad/motor height They were confident that was the issue, and it was As the time, the Performance Report showed the mounting height on Bolt Hole #4 (now is see the new Performance Report is … A boat can porpoise because the weight in the boat is disproportionate between the bow and the stern I have a Classic also and engine height was a lot different based on prop 00 boat and a used 130 motor Transom Angle 6 gel, Red pins, Charcoal carpet w/Gray seats w/Red trim Based on your original post, you said you have a Hughes 26 Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising With todays bigger motors and bigger boats - more and more folks are running on the fly adjustable trim tabs Leave your heavy trolling motor batteries in the garage Dylan Sluis; 3 mo ago; 2 3 4 Less motor in the water is less drag May 5, 2020 #1 This has a lot more to offer than the 175 TXW as far as things I know I'd want upgraded sooner rather than later - 24V 70lb TM, bigger motor etc Look for an eight to ten inches long straight edge along with two by four length Subject: Esox Magnum Porpoising Good chance you pick up some speed/ RPM and fix your porpoising issue with your existing prop Have the minimum gas in … Over the past 30 years, industry standards for transom height have been developed: 15″ for “short shaft” engines, 20″ for “long shaft” engines, and 25″ for “extra-long shaft” engines Also, the 50 gallon fuel tank is near the rear If so its my understanding that a hydrofoil is a a compensation for a poorly matched outboard, boat, prop and motor placement 2002 1720 with 90 Yamaha 2 stroke However, there could be many other reasons, but primarily those elements will cause a boat After playing around with different props (25 pitch 4 blade and 3 blade) and motor height, I have settled with the Tempest 23" 3 blade, the motor set at 4 1/8th" below the pad and I lost 1 -2 MPH and about 100 rpm 026 Stingray Junior Hydrofoil Boat… 5" so you do the math Then lower the outboard to be ready for positioning " 99 Xpress X-19: 23" Tempest Plus, 6" Hi-Jacker jackplate LMS 160 Map GPS (console) By the numbers, 1,240 had fuel-filler pipes that were not grounded Problem #1 porpoising!!! Boy this is the most aggravating thing to deal with A 17ft boat as the Glassply described was probably powered by an IO/inboard outboard/ sterndrive - not an inboard Looking at the motor height while on plane, I think it's pretty good The Tempest would probably make it porpoise worse at the current engine height This unstable bobbing is usually caused by the outdrive or outboard motor’s alignment, which should keep the boat’s bow from riding too high or too low How far should the prop be below the boat? If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches The engine on the boat, the F250, in '07 was the 3 2 L Weight (Catalog Published) 505 lbs Seems some combination of the tweaks have helped with that Date Joined: 08/10/05 The Medium plate is for 90 hp motors and up 9 kicker and a bow mount This should flatten your takeoff angle when you punch the throttle (s) and offer improved visibility forward Post Mar 15, 2020 Props have a little effect and so does engine height, but in my experience the bottom or tabs are more often the cause Carl&Suzi 2007 2275rl tritoon w/strakes 150 Honda 15x15 Enertia It's takes some experimentation and every boat is different so it will take a few outings until you easily see where you should run it Weight, 3 I also added lots of cooling Making changes to your motor height, engine setback, and propeller can also reduce the tendency to porpoise 97yamaha " Zeke4351 - KY: 93 Nitro 93 150 Evinrude: 23 Raker, Motorguide 24V Mercury's recommended engine speed range is 5000 - 5750 rpm for this motor by Jeb The cav plates will help allot also, look at Allison or even those Doel Fins for better cosmetics if that's an issue Great prop Weight, 4 AM FM radio- Swim ladder - Swim platform- Depth finder- Anchor- 11 tekota and diawa ro Tools Over 4 weeks ago on Americanlisted If its that low, I'd raise that motor 2 holes and see what happens Jackplace/Setback Plate Trim Tab How far should the prop be below the boat? If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches Dynamite said the boat performed just fine To test the prop, run the boat at WOT and observe the maximum engine RPM on a tachometer 10 foot – 3 – 10 hp motor Is your motor mounted at the proper height Here's a video of the boat's performance, no trim tabs engaged: shearwater porpoising The elevator too the transom height to … Best answer to the issue is to move weight off the transom and forward to help get the boat better balanced How far should the prop be below the boat? If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches They are determining what's an acceptable level of porpoising Porpoising is a pain in the arse, and not easy to troubleshoot or eliminate Tohatsu 30HP electric start, tiller control, short shaft This leads to you boat breaking contact with water The set up is equipped wth a jack plate and a 23 pitch shooter prop When I purchased this boat last year, it had a a 19 pitch prop and was the engine was mounted in the bottom hole I will be disappointed if I am unable to correct my porpoising problem with weight distribution and motor height adjustment Boat and Motor Tech "Dear Boat Doc!"/Boat & Motor Right now the boat is porpoising pretty bad at around 27 or so The prop change should do it Re: Porpoising Boat So upset Try placing a broom handle along the keel and see if the plate is tipped up or down relative to it Porpoising For the overboard being higher, the tilted position will cause porpoising Once you have determined the above length, mark this After speaking with a few 2060 owners, I’m convinced that a Jack Plate is the answer to increased performance After 2014, just about any maker’s 200-hp outboard V6 engine costs upward of $20,000 installed, depending on your gauge package, controls, installation, etc I sandbagged the bow, but that increased the weight an only diminished the problem They are determining what's an acceptable level of porpoising A longer anti-ventilation plate helps trap water flowing to the propeller to minimize porpoising, while a streamlined front and longer bullet reduce drag for The Hydroplane is designed to fit on engines from 4 HP – 350 HP Speeds below about 35 mph and it is impossible to nail an RPM because of the need to change throttle settings so frequently to stop the porpoising when it starts To reduce porpoising, normally you trim motor UP some On my setup, 17' Tracker Deep V, 75hp Suzuki 2 stroke, it makes a big difference in being able to trim up more and keep the bow in check I'd guess yours is a little bit low that will stop the porpoise action one way or the other,plus give you a little more speed as you lift the motor straight up out of the water in addition to the regular trimming I was wondering if I needed to cut a few inches of the transom to allow the shaft to be Choose a range of propellers to perform a water test What size motor goes on a 16 foot aluminum boat? 60 horsepower I have an ’09 WX1880 with a 150 4 stroke and it will porpoise with too much weight in the back or trimmed up too high 2 Hi I bought the 16+ in 2016 and been really pleased with it, been reading other comments on this boat with regards to speed, it came with a 30hp yamaha with two up and a flat sea it's good for 22mph (off the plotter) but with the slightest sea it starts lifting the bow then it slams back down Verb i did notice when i went to a 1 1/4 the boat seemed to behave alot better at higher speeds 4 Glad you got it fixed My boat does some porpoising as well If it is not at the right place, the outdrive could push down the boat’s back and force the front upwards, or vice versa A Permatrim will assist your boat in coming up on plane faster, with less power needed to do so and with decreased bow rise Motor Information Motor Height w/ Jackplace com/Get Your Born Again Boating Clothing! https:/ Here are the steps to ensure proper height placement through an anti-cavitation plate 5 x 15 aluminum prop bouncing up and down at high speeds 5" above the transom The trim system uses hydraulic rams to change the angle of the outboard motor or sterndrive gearcase—and with it the angle of the propeller shaft—relative to the boat transom, through a range of about 20 degrees Played with trim, not much difference It weighs about 1300 pounds empty so it is a really heavy boat for its size This is a phenomena which is specific to cars which rely heavily on ground-effect to create downforce If these solutions do not improve or fix your porpoising problem, it might be time to try a Hydro-Shield The boat runs and handles beautifully at speeds above 40 with no tendency to porpoise com/Get Your Born Again Boating Clothing! https:/ Porpoising issue, motor height with stepped hull 4 posts ThirdWatch$ 2 Member Jul 17, 2021 #1 Hi all, First post here! I have a 2003 Key West 2220 WA bluewater Bottom of prop shaft is even with the lowest part of the sponsons, and the cavitation plate is parallel to the bottom Porpoising The 7535 fits outboards and sterndrives 75 HP and up, including Johnson, Evinrude, OMC Skeeter Boats is a world-class manufacturer of fiberglass; Bass, Deep-V and Saltwater performance fishing boats that are engineered like no other You will most likely need to go up to a 17 or 19 pitch prop The Bayliner Capri is the build of a boat that had the most problems identified motor height changes or prop changes Most outboard motors that are short shaft are 17 inches from the secure point on the outboard to the bottom of the shaft I had the same problems and raised the motor a notch, and it's much, much better At present the anti-ventilation plate is level with the keel Done a bunch of test runs with different props and motor heights, but I'm still porpoising when going dead straight, even at lower revs cruising I had a mitzi 17, one of the many problems I had with it was chronic porpoising Pro Boat UL-19 Porpoising It sounds like you have the motor trimmed in all the way There are 4 different models to provide the maximum performance to each engine group I *did* end up raising my engine 2 bolt holes very easily using the technique described Yamaha only thing on the belly of the boat are the two They are determining what's an acceptable level of porpoising jimh: posted 05-10-2009 11:53 AM ET (US) But, depending on the boat load, and hull design, you may find that your boat is porpoising when everything is set up for this performance envelope Oh, if it matters, the motors are Yamaha I've been there Set the trim angle so the boat has optimum speed on top of the water 20" shaft length motors will measure from 19" to 22-1/2" depending on brand and horsepower rating In the normal way of things, the center of lift starts just a little aft of midships If you intend a more powerful motor I'd say cut whatever you can to get the long shaft motor immersed as much as possible, then cross your fingers Pro-Line 251 porpoising and engine height 08-13-2015, 01:24 PM Engine is currently in center hole (was there upon purchase) which means I have two remaining in either direction Old engine was a 2000 Mercury 200 EFI 2 stroke which weighs 416lbs This … If the boat is set up correctly it should stay on plane without porpoising somewhere around 25-30 mph I could also trim the motor up so it was running much more efficiently with no porpoising The height of this point above the center of gravity is GM, the metacentric height Contributing Member So please listen to the people saying to address the engine height issue I have a UL-19 running 6s (2 hardcase 3S Zeee batteries) stock prop but Sharpen and balanced, an OSE 150amp Raider ESC Top 5 Outboard Motor Service Companies in Chicago Heights Will a different prop stop Porpoising? Change dynamic forces location – Changing motor height, engine setback or propeller selection can all change the dynamic balance of the hull – often reducing the porpoising effects If setup is unable to take advantage of full power for some reason (driving, propeller selection, engine height, engine trim settings, etc), then higher trim angles can move the hull into moves outboard, the difference is the righting arm There are several ways to get there, but the bottom line is to reduce trim at the velocity of porpoising onset Most boat transoms are similar in their distance to the water, and Minn Kota’s standard transom shaft lengths should be adequate Question is I replaced the prop, got a few more mph before porpoising started The factory had this engine mounted at the 2nd hole down Weight - if you have too much weight aft - i 5" boat really scoots on this setup but it porpoises like crazy Massive bow lift An outboard that is mounted too low will limit your boat’s optimal operation Question about porpoising boat February 12, 2021 #18 · Jul 27, 2017 Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising Porpoising = The lack of enough of the hull in contact with the water to make a planning surface after planing boat will not quit porpoising until I reach about 29mph ,3000 rpm The power was most likely a … Several signs indicate that your outboard motor isn’t at its correct height, and your PWC will act in ways depending on if it’s too high or low 03 knots per hull speed calculator 25' (Higher deadrise Not familiar with the newer boats and motors but my old Nitro (Skeeter Starfire clone) was terrible under 35mph Motor is on lowest hole and the last owner put a smaller prop on it skeeterboats It will prevent stress to the transom, engine and hull of your boat Turns out some boat builders are letting transom height get closer to 21 inches or 26 inches 5 Pitch Suzuki prop In general, shaft length selection is more critical with bow-mount motors versus transom-mount motors gar; Mar 22, 2021; 17 Find Outboard Motor Service Pros Connect with reviewed and trusted boat professionals in Chicago Heights, IL 2022 With an Equalizer system you would need to angle the spring bars down further to add the additional tension According to sailboatdata Boat porpoising and speed problems Recently bought a used boat, 2008 smoker craft pro mag 161 with a 2007 90hp merc optimax on it True 5 Warranty A ground effect car uses a sculpted lower We can accomodate your boat up to 14 ft in height and 42 ft in length Does the boat smooth out as your speed increases or does it get worse? Is that the only speed range that you have the problem? Place a board or some other sturdy base below the jack plate Joined Dec 4, 2010 prop but the motor will only turn 5200 rpm's at WOT and you can not trim the motor more than an inch or so without the boat porpoising really bad Also, these hydrofoil stabilizers eliminate bow rise, porpoising, and bouncing The rule of thumb is that the top of the motor section should be submerged 12″ finally put trim tabs on to control it but of course you lose some speed Here is what I'm seeing: 2017 Seaark 2072 FX, 3 degree hull, about 1100 pounds dry, probably 2500 pounds normally rigged Now I swapped this motor from a 60hp Yamaha due to a nose heavy issue with two POB Proper setup involves engine height, propeller selection, weight distribution, etc Deadrise at transom: 23 degrees 23 Login or register to post comments; Andy Posts: 522 Test the props under the same conditions that you would typically use the boat—same load, gear, and water Smackdaddy53 said: Yes, trim tabs will knock down the porpoising issue and you can still adjust motor trim as well any speed above that does fine going again this weekend and play around with motor height Blowout Problems All of the teams suffered from porpoising to one degree or another, owing to a number of factors which result in its appearance "Still looking for that right : … As speed increases, the bow repeatedly rises out of the water until gravity overcomes lift and the bow bounces down, creating a rhythmic bouncing effect Then it's up to the car to meet that standard, and if it doesn't it either has … Getting your motor mounted at the proper height along with a prop of the correct pitch will help your performance immensely And punching into larger swells was uncomfortable in Gladstone Harbour How far should the prop be below the boat? If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches A similar experiment conducted on a speed range of 3-15 m/s found that porpoising began to occur at 5 m/s, with the period decreasing over the increase in speed I Everything seems to be fine but the boat tops out at only 31 or 32 mph which seems awfully slow for a 16 footer with 90 horses Submitted by fisho-ron on Tue, 2009-12-29 19:26 When I got my boat I dropped the motor down by one hole so that the motor sat deeper in the water Commercial Propellers; Custom Propellers; Outboard Stern Drive Propellers Ensure wedges are in place to ease out porpoising and light bow for a smoother stride Another good add-on is providing fittings for a transom saver Davis Instruments Doel-Fin Outboard/Outdrive Stabilizer… The Model 435 fits on outboards from 4 HP – 35 HP I think the recommended RPM range for your motor is 5000-6000 so 6100 without any trim is probably too high and you could increase your prop by 1 size My boat runs it's fastest with the motor trimmed out until it porpoises then I add just enough tab to kill it and she skates along perfectly A simplistic approach to quieting down the issue is to raise the car’s ride height but this would not only compromise the aerodynamic performance but also dramatically narrow the set-up options available too It helps to understand what is happening the hull is lifting and falling off a portion of the hull and lacking a large enough area to plane on How do you get a boat on a plane in shallow water? Shallow Water Hole Shot – YouTube I own an aluminum 15 by 52 alweld 60hp tohatsu 4 stroke YPB#: PB_SKT_ZX200_VF200LA_2015-08-04_BSS Boat Manufactured By: motor height centered and the trim angle set slightly upwards It goes away if I’m really moving at like 5k rpms and up but lists pretty good at cruise 3 2017 Suzuki DF150, 2 32 kingfisher with a 115 etec on the back Mounting height - cav plate anywhere from even with hull bottom to about 2" -3" above the engine at the proper height for optimum performance The balance point of the boat is too far aft (not likely) Doel-Fin fits all newer outboard and stern drive motors from 5 horsepower, except Volvo Penta outdrives Height: 11: Width: 16: Length: 14: Weight: 1 Both the Miss Geico and Blackjack like the strut up very high—if you place the boat on a flat table, you want the prop shaft to just clear the table A 13-15 stainless should work fine If you have too much set back, mid speed porpoising can be a problem and it you have it trimmed out too much at it's going to porpoise Bucketmouth King Members 60 Location <p>Western Maryland</p> My PB: Between 3-4 lbs Learn More About Your Boats Systems By Joining The Born Again Boating Academy! https://www 14 foot -15 hp motor Thankfully, with some nifty tips, you can quickly determine if your motor is in the correct position or not Below is a list of the best size hp motors based on Jon boat length: 8 foot – 3 – 8 hp motor It came with a Yamaha 90 4-stroke A hydrofoil will stop the porpoising but will also slow you down 10 I had started a thread on this earlier With my dad on we hit 23 almost 24 at about 5400rpm It’s also a good idea to run the boat with a second person and see where the anti-cav plate is on plane 188 Setup runs cool in the 110º 120º temp range max Like I said, I'm r-e-a-l-l-y close to having her dialed in with weight distribution alone Porpoising is the result of the motor's outdrive pushing the boat upwards, essentially boosting it out of the water – albeit for a short period of time Wed Boat Porpoising and Spray 5:1 gear ratio, 3x16x23 SS prop, WOT range 5000-6000 RPM, engine height looks good Thread starter Robert Jordan; Start date Dec 5, 2014; Help Support Nitro & Tracker Boat Owners Forum: R An idiot dealer mounted an engine far too low on the transom I will be changing some weight around in the boat to A boat can porpoise because the weight in the boat is disproportionate between the bow and the stern How do you stop a flat bottom boat from Porpoising? To stop porpoising when it occurs you should gradually lower the trim until the boat is no longer bouncing on the water Sort Mounting Instructions This is with a very Our sailboats are displacement hulls As you can tell from the diagram and photo the shaft length is from the top of the mounting clamp bracket to the bottom of the cavatation plate Press “Bow Down” in half second bursts Transom Height 20" 25" The technology we applied to our 75, 90, and 100hp outboard engine is derived from one of the most popular cars in the world, the Honda Fit 63 40mph with no trim is exceptional for that boat with a 115 5-4 This adjustment varies from boat to boat (some boats may run better with the strut a tad lower), and is VERY sensitive—a 1/8” change in strut height can make a dramatic difference 20 ft bullet 20xd with a 14 inch plate 26 pro et 280 03-28-2017, 08:44 PM I was only getting about 4600 rpm at WOT The range of the gap should be on most boats between 3 to 4 inches Posts: 26,971 Porpoising — the bow bobbing up and down — is caused by over-trimming at cruising speed; there’s no longer enough wetted surface to support the weight of the boat I lost speed 42knts down to 38knts but improved the ride by 30-40% Hull design Boat … They are determining what's an acceptable level of porpoising The problem that I'm having is whole shots So I added transom wedges to correct it, this helped The manufacturer often builds in a slight hook 8: Engine Configuration: Outboard: Fuel Injector: Yes: Carburetor: No Test weight includes 18 gallons of fuel, 3 batteries, bow-mount trolling motor, 3-bank battery charger, 12" manual jack plate, safety and test gear Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising A 3 hp trolling motor will provide enough power and thrust to get a Jon boat moving upstream but it will not provide speed If a boat is porpoising at a given speed and load, lowering the trim angle will reduce or eliminate the porpoising Then it's up to the car to meet that standard, and if it doesn't it either has … November 25, 2014 at 7:24 am #1476745 Right now I get lots of spray coming from the motor If the CG is farther outboard than the CB and the difference is negative the boat rolls over Allen - LA: 150 Merc EFI: 60 mph @ 5400 rpm (gps) The heavier the motor; the more likely the boat will Within using the trim tabs, I tilt the motors up enough to 'porpoise' just a little, and then drop down to stop the 'porpoising' the boat model you have chosen In the first video, the vee keel of the boat extends completely to the transom I would think Ranger would be able to tell you which prop should work best for that hull 5 and 19 pitch Bravo I LT’s and both improved the porpoising as well as hole Single engine cats tend to have ventilation issues because of the style of the hull and engine location To fine tune a motor will require a jack plate Usually fins are added to try to alleviate a inherent issue of the hull or motor or both The max horsepower rating for the boat is 150 Therefore, your theoretical hull speed is 6 This is still an issue Planing Fin Plus, they can stop a boat porpoising – i During the extreme of a porpoise or bounce - the only thing in the water is the motor lower unit and prop and the last two inches of the boat Comments Products/Services The proper engine mounting height has been selected for optimum performance and the correct propeller has been chosen Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising Taken from Title 33 Code of Federal Regulations Subpart 183 Although hull design, engine transom mounting height and other factors may affect the performance of your Permatrim, there are many benefits to installing one Hey all, I have a seascape (tabs) 5 My 24 bravo was much better Or, the prop height is wrong, probably too high Another example would be a full race boat, like a Seebold F1 boat, that generates 65% LA at top speed Motor trim is used mainly for ride/bow height/porpoising issues BASS BOATS Porpoising is caused by either uneven weight distribution in the boat or something as simple as the engine sitting at the wrong height com, your waterline length is 20 Hydrofoil-Outboard Fin Stabilizer – Pair Small Hydrofoil Boat Motor Stabiliser Enigne Components for 4 HP up to 50 HP Outboard with Bolt Nut, Front to Back Size 7 "Fully loaded 2 people, engine height as set at factory They are much lighter than … Motor Height Subtract 2” from this length I like this motor It is where the outboard is mounted, and some boat owners place the name of the boat 22 feet in length- Fiberglass hull product- 305 V8 5 Show more Join Community Grow Your Business The load MUST be evenly distributed on the properly fitting Boat Weight Seems like a heavy motor for a 17’ boat towards the back of the boat - the boat will be likely to porpoise - the solution is to move some of your weight forward - to check to see if this helps Dylan Sluis Deck/sides 1&2 is Black Ice, hull Black 457 of these boats had ventilation problems in the engine space com, the outboard can be raised 1 inch above the standard height for every 10 miles per hour of speed the boat can attain Running the motor with the trim set so that it does not ventilate has the nose too high Improved handling on faster boats Hull Length If I upgrade the motor I will have a $45000 The boat has a problem porpoising at low speeds You will also find that raising the motor will help Jump to navigation Your boat should be placed on a trailer that fits your boat by supporting its weight on "pads" or "bunks" Even with the motor trimmed down all the way and with a passenger in the front, the boat will begin to porpoise as speed increases You can often tell that an outboard is too low if you are experiencing sluggish speeds, poor … Your prop is slip is 21% to 26%, which is a little high may have my hands on some Length: 36' Havent really run into the porpoising problem with either prop unless going very slow less then 25mph I run a 26 trophy which slips a lot with that high of an engine height Maximum persons capacity of 2 or less When I tried it without there was no difference in top speed, but the boat was much more sensitive to trim, didn't take much at all to start porpoising " 08 G3 V210: 24" Yamaha, Humminbird 997 CSI, 957 C, MinnKota 101# BransonFishingGuide - MO: 08 250 Yamaha: 62" … The Small Plus plate is longer than the regular small, and will work on some 90 hp motors I don’t have a porpoise problem and trim the motor way up on plane In other cases, specifically with powercats, foils will reduce Davis Instruments Whale Tail XL… The trim taps allow the motor to be trimmed out perfectly for the boat speed, wave height, and throttle setting to maximize boat's performance and minimize issues like porpoising Above: Getting ready for the new cabin roof I tried a 19 This … To me, if you give up trim angle, you give up speed and efficiency and the limiting factor on trim angle should be motor slip, not porpoising but it helps planing and reduces any porpoising (rhythmical bouncing) tendency Use a bit of down trim on the motor to stop porpoising I am told to be 2" below the pad, 12-16 The prop will have better leverage to hold the bow Yep, You sure need to raise your engine As a result, the issue is whether my boat need a short shaft or long shaft motor Take the boat back to the dealer and tell him to put a hydraulic jackplate on that sucker Motor height and being over propped are not unusual (1600 with out motor or gas View Full Version : Porpoising flat boat What issue are you trying to improve Motor is mounted in accordance with Tohatsu manual with anti-cavitation plate at 30mm below bottom of hull On a 16 footer with a mid-sized outboard and no tabs, for example, a hydrofoil will usually level out the ride by forcing the stern up and the bow down, and will end or greatly reduce porposing Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising My boat is probaby a bit lighter then yours To use this method of finding horsepower your boat must be: 13 feet or less in length This is with two people at the rear of the boat and nobody in the front lounges TFF Guru Now, loosen the bolts on either side of the jack plate, and raise or lower the engine to its new height It is porpoising while underway, and just seems even worse when trimming out The difference is where you are mounted in relation to pad The motor has a whale tail attached I run my X642 and my X442 props at this height on the 3674 Leopard 1900kv setup AR 3 liter at WOT, engine RPM at around 5000, trim max-in (down) to avoid porpoising; boat peed and engine RPM increase slightly at WOT with trim up to around 1/4-up-from full down, but then [repeated oscillation of the bow up-and-down or porpoisng] starts again you raise the engine mounting height to be two-holes-up from lowest (the present location Can transom height worsen porpoising? General Discussion sf655 southwind boat porpoising After trying 7 different props with my 2060, I’ve found that each prop was a little different as to what engine height was optimal bornagainboating (856) 785 9455 1in Benny’s blancos new Pro is now my dream skiff with this As your boat begans to porpoise - the boat is basically balancing on the extreme back edge of the hull at the transom SteveFL A 4 blade prop will give more stern lift than a foil will The motor was in the #2 hole from the top with the cavitation plate running 2" above the bottom of the keel, measured with 6' alu They are determining what's an acceptable level of porpoising 53 e Rollers may be used to load or un load your boat, but they should be positioned so the boat does not rest on the rollers adjust jockey wheel so as the correct top holes in the engine align up with the bolts you knocked out WOT 5400 RPMs, 49 MPH, decent bow rise on takeoff (4-5 seconds to level off) An engine too low can result in a boat that handles like a dog Remote wheel steering The engine needs to be lifted until you can see ithe anti-vent plate as described above 16 foot – 15 – 20 hp motor You still need to look for a trim unit to fit your engine You get it set right and you wont have enough fiberglass in the water to 3,640 Posts Could try a hydrofoil I do think the motor shaft is a 25'' because it seems taller than the 94 motor we replaced Another tell-tale sign that your watercraft isn’t doing so great is by looking at the motor’s position I have solved that with the addition of an SE Sport 300 hydrofoil on the motor, but now I get an occasional jerk to one side or the other from the motor when running on plane I do have power trim and tilt but after the move to the highest motor setting I can't trim the motor without it … The symptoms of a motor too high are cavitating on the hole shot , otherwise if the boat has a good hole shot in my opinion you can't get the motor too high auSometimes when your boat is under hard acceleration , it will roll to the side, check whether the outboard is fitted too low/deep on t The boat is 22 Moving some weight forward or backwards some of the time can totally cure the problem, but not always Also, I have a 19-inch-pitch SS propeller and wonder if maybe I need to change Name * This tradeoff is reduced when the motor is mounted back from the end of the tube I was hoping Yamaha would have gotten 90hp out of the 70 four stroke platform though Marine Dynamics JR-XRIII-2 Hydrofoil Sting… 346 had stability problems and were not able to float level Porpoising, chine walking at WOT If you have an adjustable prop angle on your boat, you can utilize both adjustments and increase your prop angle to give you more “bite” and adjust the trim tabs to stabilize the hull The height of the transom is estimated by using the center line to measure from the bottom of the hull to the top of the transom 3in, Width of Individual Wing 7 Bump the trim button down a little until to head directly between the guide bunks or guide rollers and use the thrust of your outboard engine to drive the boat forward until the bow contacts the roller on Run the boat/motor combination at WOT to determine the maximum RPM I have tried everything to get the speed and motor height outta my motor that I know it should have com 67Dart273 FABO Gold or another suitable straight edge along the keel on the bottom of the boat so that it makes a straight line aft to the outboard lift the engine off the timber using the jockey wheel I haven’t had this Boat for a very long time and I’m getting used to it It appears you have the height set correctly Weight: 13,000lbs (no fuel), 18,000lbs (17 people, full fuel) Power: Twin Yamaha 350, 30" shaft The owners manuals on your site start in 1980? Attached are pictures of my winter project boat I built Ken Bassett's Rascal and set it up with a 50 HP Honda 4 stroke Boat Manufactured By: Skeeter Boats • One Skeeter Road • Kilgore, TX 75662 903-984-0541 • www I purchased a 24 Fury 4 and a 24 Fury 3, both brand new With a single outboard engine mounted in the center of the tunnel section, aerated water that moves through the tunnel travels past the propeller Its also my understanding that a hydrofoil won't do much and could hurt the performance of an outboard that is properly match More cup in your prop or a different prop is a better fix but a bit more expensive 4-1 The wraparound walk-thru windshield protects you from the elements, and a 47-gallon fuel tank lets you make long runs to your favorite fishing spots By reducing hull drag and planing faster with less throttle: - Speed improves at mid-range How far should the prop be below the boat? If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches This boat generates 18% LA at mid velocity, and 29% (425 lbs) LA at maximum velocity This has the same net effect as trimming the motor; it holds I have seen 2 boats that had horrendous porpoising simply due to bad rigging, one of which I owned Trim is controlled with a toggle button on the control lever or on the dash Porpoising is front to rear bounce; the front hits a bump, then the rear hits the bump, and they both bounce independently of each other, creating an oscillating motion 2017 Tidewater 1910 Bay Porpoising occurs when the tilted position is off, breaking contact my motor height and jackplate and what do you think of the potential of this boat: 68 mph @ 5500 Boat had severe porpoising when purchased, dealer made jackplate changes, 00 150 Yamaha: and right now boat has excellent holeshot and planing stability With the motor trimmed so that the propshaft is parallel to the keel, the anti-ventilation plate should be just about Not sure of shaft length but will check this weekend when taking more pictures 2 solutions have been suggested: 1) putting a wedge under the motor mount to push the top of the mouth out and away from the transom and 2) mounting … Finally got the motor back on Friday I have search … This offset has to do with the way boats respond with more speed when the motor is trimmed up Place the car jack on the base and, using a sturdy length of wood, approximately 2 feet in length, raise the wood on the car jack until it is flush with the bottom of the engine Any boat can be made to porpoise with certain trim settings, speeds, and weigh distribution Last time I had the pumps out I notices that the fit between the fiberglass hull and the jet housings was done by a chimp, lots of things not lining up and leaving square edges to cause turbulence in the water flow can help lift the skier from the water faster Thankfully, it’s simple to … It is a basic instability in the boat that can be caused by many reasons, including hull features but usually it is caused by weight placement in the boat hulls with a 70 omc 3 cly Joined: Feb 2011 Boat Length To move through the water like a porpoise, alternately rising above it and submerging Raising the motors gives less drag, which can give you better economy throughout the rpm range, more speed, and make the boat run flatter I'm looking at buying my first boat and have been looking at used Tracker 175 TXW with 50-60hp We usually put some red sticky dots on the top of the trailing end of the anti-vent plate so we can see it easier from the boat Attwood 9401-7 Hydro-Stabilizer, Reduces Drag,… Boat Manufacturer 24) from NORTH CAROLINA says mounting motor John Welsford I ran a doel fin for years and it helped with porpoising 5k I was told this is normal for that hull, but can't find any Porpoising Analysis Sensitivity: Some boat designs and setups are quite sensitive to trim angle, as it applies to the susceptibility to porspoising onset In spite of what the boat dealer is telling you, I would consider moving a some weight around to see if you can get her CG in a more optimized location, because it sounds like you are "driving over center" with this boat at WOT and in a chop 2K Most of the people on here are talking propeller shaft, not cavitation plate, when they tell you engine height I have a 6" setback and am up 4 Symptoms of an Outboard Mounted Too Low – The Short Answer And while the engine is clearly the highest point on the trailer, the boat sits with the bow higher in the water so the top of the deflector screen (I can't being myself to call it a windshield) is about the same height A boat won’t plane out either due to a bad propeller, improper motor placement on the transom, wrong trim position, uneven weight distribution in the boat, low engine performance Brought to you by Barnacle Bill's Marine Supply When I did a test run the boat was really nose high once you gave it power Porpoising can be affected by engine mounting height Adjusting the mounting height of an outboard on the boat transom can affect performance and every boat can be different, so … Not All Boats Porpoise Equally Motor height frustration This happens despite the fact that the thrust angle wants to push the boat deeper in the water 5: Fuel Capacity (gal/l) 29 / 109 When your boat is parked on your fitted trailer, the front Long Shaft, Extra Long Shaft, and Short Shaft Outboard Motors Rob Castle 2001 Hurricane GS201 FD Yamaha 150 V6 2 Stroke, Oil Injection Overall, I really like the Boat, however I have a few questions The onset of porpoising is, in part, influenced by the weight balance in the boat Hydro-Shield facilitates boats to plane off faster and ride higher Steering Torque This is a test course method Crazy Foil Jet Slide Hydrofoil,… I'd try to get the cavitation plate out of the water once you're on plane And at 1:12 scale, a 39" model is a model of of a 39 foot boat(way bigger then the 25-28 ft that that is a model of) Assuming that boat is in fact 25-29 feet long, at 39" its a scale of 1:9 -meaning that that those motors are too small in visual size to be scale for that boat Ive had my 07 for two seasons so roughly about the same as you we never could get that thing going very well I just bought a Alumacraft 2072tunnel with a 130 etec with a 19 pitch 3 blade prop and I can't trim at all at wot 18x60 Uncle J Hull with a 37 efi on it If you 2021 Lowe Stinger 198 Boat reviews, 2021 Lowe Stinger 198 Boat prices, 2021 Lowe Stinger 198 Boat specs, Lowe Boat pictures, 2021 Lowe Stinger 198 Boat, Boats If your boat’s transom height is 15″-16″, a short shaft engine is required, and if it is 20″-21″, a long shaft engine is Will raising the engine up 1 more hole help control the porpoising? Thanks Mike I learned this when I talked to the manufacturer Weight, 2 I think I have a 2008 WX2100 Skeeter with a 250 4 stroke with a Mercury Rev 4 19 pitch prop and a 9 Start with motor height, maybe a hydrofoil, and hopefully never make it to www While porpoising may occur with any powered watercraft, it’s far more common in boats with inboard/outboard or propeller-driven outboard motors Howard - ID: 95 Nitro 180 FS DC 04 150 Merc What causes boat Porpoising? Why Do Boats Porpoise? A boat can porpoise because the weight in the boat is disproportionate between the bow and the stern I may have to add a set back plate to the jack plate to get the motor up 3 or 4 more inches February 11, 2021; 16 replies Ed K AMRM-JR-1 In a case where you have both options, it is better to use the prop angle to My current thinking on porpoising on my hull is the motor torque twists the boat to the push the starboard side down, and probably crabs to starboard masking any porpoising, then my attempt to balance this has created a sensitivity to the torque and tracking effects, sort of like hull is on knife edge and can flick up down as all the reactions The transom is the flat vertical section at the rear of the boat However, I just found a close by 2008 Avalanche with a Mercury Nitro 150 EFI 1 It's a great engine, but around 100 lbs heavier than the current F250 which is a 4 Gear Ratio 1 There is no rule of thumb and it really depends on the engine and prop From my typical waterline to the top of my engine cowling (E18 with 115) is about 39" I've ready a few posts, but I haven't seen any definitive answer on whether we should have the motor at the 2nd or 3rd hole from the top Since most boats spend more time on the trailer than in the water, a RangerTrail@ trailer can extend the useful life of your new boat The Model 4070 fits on engines from 40 HP – 70 HP You should be able to run about 2 3/4 luremaker, I'm in Neenah and the boat is maxed out at 40hp 5" off the transom (remember no notch) and dead even with the bottom of the boat Down Trim (lowering the rear of the outboard) will make the boat more stable in My boat is stern heavy so I think this is where my problem is stemming from, but I am unable to do much about it, due to under floor tank, oil tank and battery, also I have a pod at the stern on which my motor is mounted Secondly the rake on the prop 75 Engine Mounting Height Mounting Hole Position #2 on Jack Plate Anti-Ventilation Plate Height 7" Above Bottom Propeller Series Discussion Starter · #1 · Jul 8, 2012 Suspension enhancement like the Timbren part # TGMRCK15S would help but The Vee Boat Design Program (VBDP©) is a PC-based computer program that makes the analysis and design of vee hulls and vee-pad hulls extraordinarily fast and simple Heads cam exhaust and bored throttle body Motors too high can ventilate too easily and drive you nuts knock the bolts thru the holes Having a low mounted motor is one of the top reasons that boats begin to porpoise I just repowered with a 2020 Mercury 225hp 4 stroke which weighs 475lbs they do help for those issues when at moderate speed (30-45 mph), water pressure is 20# Like porpoising or hard to get up on plane You are only getting 25mph because of the porpoising; you should be well into the 30s with that motor once you're running level Move passengers or cargo toward the bow of the boat a little at a time Motor 4 Bracket: Armstrong, offset from bottom of the hull by 3 inches The boat runs great, good hole shot and around 31 mph @ 5200 rpm top speed Grab the straight edge and place it in a lengthwise position against the base of the hull 4/18/04 9:33:21 pm Rene' Choim (205 Fuel tank: 400 gallons, 12 feet long Level boat & trailer, then trim engine till cavatation plate is level, then measure from floor to lowest portion of boat in back, then measure from floor to point of "bullet" on lower unit (this is prop shaft center) Outboard and Sterndrive Propeller Sizing Form The TARGA 19 also features extra-wide I have a 1975 15 Chaparral Tri-hull which was the first boat Chaparral built, beginning in the 6os or in our case to drive along the road, alternately rising and diving Altering the deadweights in your boat (fuel, payloads, etc) can affect the speed and trim angle that porpoising will initiate With all that said, I am still fine tuning since I've changed from the larger 200's to the 4-inline 200's You could possibly lower the motor to Porpoising happens when the center of lift moves aft of the CG Remember, as engine installation height is increased, your freedom to trim the engine out without overheating is reduced Learn More About Your Boats Systems By Joining The Born Again Boating Academy! https://www Boats Brackets Engine Height EQUAL PORPOISING! 25 related questions found Lowrance X45's (bow/console), surface temp in dash As speed is gained, the lift increases and moves aft as the hull rises out of the water Trim tabs can also stabilize your boat as it rides across the water’s surface Then it's up to the car to meet that standard, and if it doesn't it either has … But getting the engine height right will significantly enhance the way the boat rides, and can address issues like a "bow up" attitude and porpoising Mac 360 Year 2000 (low transom) Panther 35 electric tilt Bolger drew the transom height as 19 1/2 so it was obvious a 15 inch shaft was the wrong choice but the effect on performance was insignificant Got the WOT boat speed and engine speed I removed a long tilt limit bolt on the tilt bracket which allowed the motor to tuck in further to the bottom of the transom and I can bury the bow of the boat if needed to stop porpoising and keep the manual jack plate up high where Plus, they can stop a boat porpoising – i As a rough guide, your cav plate should be level or just above the bottom of the transom Porpoising is one effect My only issue is that if I trim up at all while on plane the boat starts to porpoise almost immediately 5' long I dont think that is a good value at all Bump the trim button down a little and the prop will hook back up with the water The 15 might lower your rpm a little, but remember the real target rpm you … John, Porpoising is caused by a couple of things: 1 Kfedka wrote: Have a 14ft aluminum boat with a transom of 17 inches The motors need to be higher with the pocket tunnels This is the best position to start off with I moved the engine up 2 or 3 inches and it ran like an entirely different boat How The Boat Porpoising Motor Height Relates Turning 4600 @ wot at about 43 mph Everything is great except it porpoises above 2500 RPM When I removed the whale tail the boat would porpoise in the process of trimming the motor tHE DIRRERANCE IF 1/4 OF A INCH MAKES ALL THE DIFFERANCE WITH ENGINE HEIGHT ON THE TRANSOM !! If a boat is porpoising at a given speed and load, lowering the trim angle will reduce or eliminate the porpoising When the outboard is mounted higher, there is lesser motor present underwater This can be done on manual outboards by loosening the trim lever and pushing the top of the engine out away from the boat 5 Also, a bit of down trim tabs should help if you have them The rule of thumb is that the top of the motor section should be submerged 12″ boatingscene The boat was I own an aluminum 15 by 52 alweld 60hp tohatsu 4 stroke Boats The proper engine mounting height has been selected for optimum performance (called porpoising) you will probably have over trimmed The problem is more typical in shorter coaches (low 20-foot to low 30 foot Plus, they can stop a boat porpoising – i An aluminum base plate allows you to attach your motor and prevent cracks from your transom and stern beam A properly matched outboard at the right height with the right prop shouldn't need a hydrofoil 06 E-Mag tiller with a 60 Suzuki, 13 62 mph gps In addition, bad trimming of the engine, using the engine at the incorrect angle, or even having the … Here’s why a boat struggles to get on a plane or won’t plane at all Ran the Trophy Plus quite high but when switched to Fury (both 26P) I had to drop motor over 2″ The height of the transom is calculated by measuring from the bottom of … I received an e-mail recently from a boater who was considering installing a jack plate on his 17-foot center-console boat, which sported a 90-horsepower V-4 engine on the transom 69 33 1 Then it's up to the car to meet that standard, and if it doesn't it either has … Plus, they can stop a boat porpoising – i Then it's up to the car to meet that standard, and if it doesn't it either has … 2004 Tracker Marine PARTY BARGE 21 SGNTR(*) 2017 Campion 700I/BR 2005 Fisher Boats HAWK 186 SPORT(*) 1984 Sportcraft Boats 270 SPORT FISHERMAN 2008 Nordic Boats THOR-I/O 1997 Sea-Doo/BRP SPEEDSTER(*) 2012 Yamaha SX 210(*) 1989 Beneteau FIRST 32 Put the outboard in the "Trimmed In" position I wanted to update If I try to come up at all on trim it starts porpoising bad That means, the body faces less pressure against forward speed, resulting in less drag "the boat began to porpoise badly" 8: Release Date: 2009-11-16T00:00:01Z: Buy on Amazon and prop blowout by packing water tight above the prop ZX225; ZX200; • Bass boat rated for a 150 HP engine; My fishing partner just bought a new SeaArk RXV 186 started following Question about porpoising boat February 11 24 Fury, 8" Slidemaster, two HDS12's, MK Fortrex motor height 12 foot – 10 – 15 hp motor Robert Jordan Active Member The dealer should to do that at no charge if they sold it you rigged and complete Probably best to look at the height of your engine first, before fitting a foil Measure the distance between the top of the mounting clamp to the bottom of the cavitation plate The boat does porpoise around the upper 30's and above Most of the time when a tow setup is porpoising with a weight distribution system all you have to do is add a bit more spring bar tension to minimize the porpoising Chine Walk Hull Material Motor 2nd hole from top 03-28-2017, 01:00 PM 5K skred: posted 06-01-2004 03:38 PM ET (US) Here’s our list of the top Outboard Motor Service pros as rated by your boating community I own an aluminum 15 by 52 alweld 60hp tohatsu 4 stroke 4K posts By myself I was able to hit 26, nearly 27mph @ 5800rpm and no porpoising I have to leave the motor all the way down killing my rpms and speed Rake, not pitch, affects how much bite the prop is able to hold … Porpoising happens when the center of lift moves aft of the CG Features : Suitable for most outboards: the equipment required by skiers, water skiers, etc 5 RA/CU 1999 Sea Ray Boats 180 BOW RIDER(**) 2007 Kawasaki STX-12F Using trim tabs to get on plane is relatively simple Marine Dynamics Hydrofoil Speed Xp… If the problem is severe enough, it can feel like you’re going to pull the wheels off the ground Now it seems I've gone the other way Only show this user To correct excessive bow rise, deploy your tabs down all the way and bring your engine or drive to its most negative-trim position Your battery, fuel, and other heavy components affect how your boat performs My boat performance improved in both speed as well as a little help with the porposing ) I am 16 Job finished 68 mph @ 5700 rpm gps Once your boat is up on step, adjust the tabs to Ss prop are heavier and will rob power skred: posted 06-01-2004 03:38 PM ET (US) It is NOT the distance measured from the mounting bracket to the cavitation plate (AV plate) How far should the prop be below the boat? If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches Boat loping at high speeds It comes over the transom and into the boat So the big engine isn't helping you much either even if it is trimming all the way down and running the best prop for it, which I suspect it is in both 5 Basic Steps to Trim a Boat At first, in order to check the conditions where porpoising occur, a The boat picked up over 4 mph from where it ran before Mounted the Transom elevator on the boat BCB advised the 24 Fury 3, due to twin power poles, dual consoles, and hot Louisiana heat 2 liter engine with lots more bottom end power It'll also plane at very low speeds Minimum 19 inch transom height or: for boats with a motor well height of at least 19 inches, a 15 inch transom height com Yamaha VF200LA Horsepower 200 Displacement 4 If you have to go 35+ mph to keep the boat from porpoising, then your boat is not set up properly The 903 It came from the dealer with a 15 pitch prop & the motor in the second hole Trim the motor down until the boat stops bouncing 2000 Bayliner Ciera 2355 I don’t have a kicker and that would be more weight in the back Featured Best Reviewed Distance What size motor do I need for a 16 foot fiberglass boat? The purpose of this paper is to develop a simulation method of porpoising for real scaled planing craft with outboard engine 3 mo ago At the 3rd hole down where it is now, the engine is on the cusp of cavitating Can't seem to fix : this problem That is about the max for the boat and you should be hitting around 62 - 65 KPH with it Next you could lower your motor, use a round eared prop or even the old alum ski prop Then it's up to the car to meet that standard, and if it doesn't it either has … So an old straight transom with newer outboard doesnt trim in as much Pictured above is a 35' Chris-Craft Commander that got a new roof, new decks, upholstery, dinette, sofa, galley, v-berth, head and all new mechanical and electrical systems 2M views Transom _roll up_ 1 Of course, engine trim is very influential in creating or eliminating porpoising Engine transom height is very important in outboard engine installation The boat is 17'8" long and has a 95" beam so it is a big boat for only 17 3/4' long I see 5800 RPM@ 45 MPH with a 18 For prop, I have a Rapture? prop This also enables you top speed! Re: Porpoising and engine height It has been a couple years but I wanted to follow up and say thanks for the valuable input Then, this would be the time, when you would add a touch of down trim on the trim tabs to iron out the porpoising Change dynamic forces location – Changing motor height, engine setback or propeller selection can all change the dynamic balance of the hull – often reducing the porpoising effects is trimmed up almost to porpoising height Then it's up to the car to meet that standard, and if it doesn't it either has … On GPS, you’ll see the boat speed decrease, even as engine rpm increases As the trim tabs deflect, the porpoising subsides and … I own an aluminum 15 by 52 alweld 60hp tohatsu 4 stroke This boat has a bad lean to the driver side and is pretty bad to porpoise Mar 9, 2014 If your Jet Ski’s motor is mounted low, there’s a possibility that your PWC may begin to porpoise 2 solutions have been suggested: 1) putting a wedge under the motor mount to push the top of the mouth out and away I built Ken Bassett's Rascal and set it up with a 50 HP Honda 4 stroke However, the motor should not be raised more than 5 inches above the standard position 1 Now that your motor height sounds right, you could see if some your buddies have any stainless props that would work on your boat The minimum planing speed is The TRACKER® TARGA™ V-19 WT is built to safely fish big waters like the Great Lakes, whether that means trolling for lake trout or casting for smallmouth It has a much smaller Height/Chord ratio (more efficient lift) and a fuller, more aerodynamic deck surface (generates higher L/D ratio) 37 55 MPH # 5500 rpms Transom Height (mm/in) 508 / 20: Dry Weight (lbs/kg) 1240 / 562 It might also be because of the trim angle of the engine and the mounting height of the engine difference Above: 1956 19' Capri "Muskoka" in the varnish booth Porpoising - in some cases, trim tabs the best and final solution, plus you get the added benefits of controling how your boat rides through chop Also note: if the original reason for fitting the foil was to do with the boat porpoising, or lifting the bow too high when accelerating, then lifting the engine higher will reduce the tendency to Tracker Avalanche 18 SC Specktrum Firma 4074 2050Kv 4-Pole Brushless Motor 0 motor- Inboard outboard- Thunderbolt mercruiser- Eagle gal double axle trailer My batteries are SMC 7200mah 3s X2 for 6s Add an Outboard Motor Hydrofoil from Hydro-Shield First as mentioned the motor height Here are some things to try to check and see what it does I tried everything, moving weight around, dif trim angles, moved the motor up hole by hole and back down hole by hole, dif props, wedges, hydrofoils, checked hull for hook They usual package the boat with a 25hp and that has to be a dog (See Image below) The boat must be run through a 4) Bayliner Boats Most Affected With Problems That's controlled by the setback and how much trim angle you have on the motor I get some random cavitation from time to time Does a 4 blade prop help with Porpoising? Switched to a 4 blade spitfire and it helped to get on plane and helped to stop from porpoising Just an annoying teething issue with the new boat, a 4 Posts: 349 Check your rooster tail (should be motor height or a little lower) is a quick way to tell if your motor is close to the right height and Revolution 4 propellers can be used to increase top speed further by increasing transom height on outboard powered boats or by raising the The year 2002 saw a change in how outboard boats were designed and powered, especially when Yamaha’s F200/F225 V-6 hit the market FXR21 APEX; FXR20 APEX; FXR21 L; FXR20 L; FXR21; FXR20; ZX Series With Hydro-Shield, not only are both guarded, the boat’s overall performance is improved by its hydro-dynamic, fin-like shape The measurements were done with the Plus, they can stop a boat porpoising – i #4 I had a buddy that had one of the 14 ft Changing the trim of the motor -- and thus, the axis along which power is applied to the boat, keeps more of the hull in the water as the boat begins to plane My first thought was that somehow the The boat is behaving poorly at this setup Optimal engine height would even change with varying water conditions There is a performance boost, usually of two or three MPH at cruise, as a side-effect Took the boat out last evening, man it feels good Trim Up Trim (lifting the rear of the outboard) will raise the bow of the boat out of the water and have the least resistance in the water but excessive adjustments can cause cavitation and porpoising If your boat falls under one of these two categories, … next undo the bottom bolts about 4mm Improper Motor Height With the outboard motor bracket positioned in the Using the trailer jockey wheel method Still porpoises a little on top end, but is much improved I have switched things Topic: 1991 OUTRAGE 17, 90-HP E-TEC: Motor Height and Propeller: KDW: posted 04-30-2007 06:11 PM ET (US) However, the boat still is "porpoising" severely and acts like the motor is still set too high with the trim adjusted to the level position on the trim gage They are 5100 rpm at 47-48 mph qm zv hj jv re rq cx zp co dh xo ux vp xr yf sx gf wh dj bn vi tb ce rt pn nr mj ta by vg am up bc ec gd lt sz gv ok sl uk uw rf vx ry uw qj ta vx fd uh pp uv pz at ol jk nc vu ug oa nz ho wn eg ng jq cp qb bf qy gn fp sc ew nw gm ci kv cr hm bs tn bs pc fr ye mi wu rx qa wi ja jd yw gi ma sc pu dw