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Boat not planing http://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=6&t=72561 |
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Author: | thompsoncustom [ Sun Jun 10, 2018 8:36 am ] |
Post subject: | Boat not planing |
I have a 1658 riveted jon boat with a modified go devil 23hp motor on it. I rebuilt the motor from the ground up and really happy with it's performance so far. Biggest problem I have is the front of the boat always seems to low even with just me in it it's pushing water up front. If I move as far rearward as possible I gain a mph or 2. As far as weight on the boat there is nothing up front, motor and gas tank are in the rear. Anyway to adjust the motor/boat to raise the front of the boat up? I know on a outboard I'd just adjust the trim but not sure what I have for options on this motor. Thanks Dan |
Author: | Russ [ Sun Jun 10, 2018 10:45 am ] |
Post subject: | Re: Boat not planing |
Sounds like the only solution you're gonna have with that combo is to cut the transom down some to lower the mount point so the motor doesn't lift the rear/lever the front down as much. #CFFITR #TheGhostBoat #whoneedsphysicsihaveamudmotor |
Author: | stualaska [ Sun Jun 10, 2018 1:49 pm ] |
Post subject: | Re: Boat not planing |
Check for a hook in the bottom just fwd of the transom. A very small hook will cause what you describe, especially with a boat as wide as yours and the limited torque of a longtail. |
Author: | thompsoncustom [ Sun Jun 10, 2018 4:00 pm ] |
Post subject: | Re: Boat not planing |
Transom is 16in tall. No hook in the rear of the boat except the weld line at the end. |
Author: | Russ [ Sun Jun 10, 2018 4:48 pm ] |
Post subject: | Re: Boat not planing |
Yeah, fill a few sandbags and put them in the rear of the boat. You have a problem few have ever experienced. Rake is too short because you have so much lift with the wide and light boat. Most of these boats never experience a problem with the rake being too short. #CFFITR #TheGhostBoat #whoneedsphysicsihaveamudmotor |
Author: | thompsoncustom [ Mon Jun 18, 2018 2:45 pm ] |
Post subject: | Re: Boat not planing |
Sand bags worked just like you thought they would. Started with 5 bags (200lbs) at the very rear of the boat and it planned great. Didnt effect top speed but seemed like a smoother ride. More testing is needed to fine tune it as i got rained out but i think as little as 2 bags might be enough. |
Author: | Glades Ranger [ Tue Jun 19, 2018 4:57 pm ] |
Post subject: | Re: Boat not planing |
Suggest you replace sandbags with ballast cooler full of beer and ice! Is the "modified" 23 HP GD motor a longtail? |
Author: | thompsoncustom [ Tue Jun 19, 2018 6:37 pm ] |
Post subject: | Re: Boat not planing |
Yup it is a long tail. When i bought the boat it had a 16hp vanguard on it and i wanted more speed so i thought ill just build a monster 23hp precision cam, heads .050 lower than stock, total seal gapless rings, billet valve retainers with double coil springs, custom dual 1in straight pipes, idk what else but everything i could think of to get it to go faster. Problem is i didnt understand its a longtail and there just not made for speed. Oh and dont worry the sand bags are just for testing but i think the fully stocked cooler sounds like the best idea. |
Author: | Russ [ Tue Jun 19, 2018 7:25 pm ] |
Post subject: | Re: Boat not planing |
Longtails run faster on longer/narrower hulls than yours. Yours will run very shallow (shallower than most) and carry a good load, but you'd pick up more speed if you subtracted 8 inches from the width, and maintain the load carrying by adding a couple ft of length. The problem you have is a nice one to have for all reasons except speed, hence the problem lol. A surface drive would suit that boat better, if for no other reason it would add 100lbs at the transom and get the bow up because of the drive angle. #CFFITR #TheGhostBoat #whoneedsphysicsihaveamudmotor |
Author: | thompsoncustom [ Wed Jun 20, 2018 6:21 am ] |
Post subject: | Re: Boat not planing |
I can live with it doing 20mph for now, maybe adding the right amount of weight in the rear will get me 1 mph or more if im not pushing water the whole time. I wouldnt want to give up the boat tho because running shallows is what i really need, not a crazy amount of mud or weeds to worry about on the wapsi just sandy shallows and trees that might go 100% across the river. If i ever find a great deal on a 35hp surface drive that would be my dream motor, i would love to modify that motor to the wall, not sure if it doable but i would definitely try to put a tiny turbo on it as well. |
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