Hi all,
just swapped out a .25 go - engines nitro for a .26 Picco Red Dot in my 32" mono.
this was just a test to see how the Picco and the boat performed on the water.
Well to say the least it went better than expected but at speed all she did was bounce .... see vid below
With the power ( or the lack of) with the .25 Go-engines POS this did not happen.
In the vid above, nothing was changed in the boat from stock except the engine. The prop remains stock along with everything else and the Picco was a direct drop in with absolutely no modifications ( except throttle linkage and minor mods to the marine flywheel to fit the Picco)
As my experience with boats is somewhat limited I'm after some advice on why this happens and how to stop it.
The boat is porpoising, I don't know alot about rc boats. But we used to stick 40hp outboards on 12 foot tinnies, When the motor was trimmed out to far it would do what your boat is doing. So to fix it we trimmed the outboard down or got some1(if they were game) to sit up the front, The less the boat is in the water the faster it goes.
They have a trim plate of some sort yeah? trim it down a bit and try it, or shift a bit of weight up the front.
I have set mine for about 29% i think it was. Basically measure the length of the boat. 29% of that from the back the boat should balance on a bit of pipe or something round.
The more powerful the motor the higher the CG needs.
I have a small elec boat that is exactly the same but maybe 10 times worse than yours lol. If i am not careful it will flip with to much throttle.
I would be playing with just a simple bottle of water n position it in front of boat. If it still bounces add more if it runs to wet take some out. Easy way to just muck around.
But good work with new motor. It seems to really hum along.
I realise this is an old thread, but I can help you out with your trim problem quick and easy.
Have your trim tabs straight and flush with the bottom of the hull, just like an extension of the hull bottom, and raise or lower the strut angle until the problem disappears, raising the trim tabs will only make it worse.
The reason it's doing it is that it's planing higher than before and loosing stability because it's trying to chine walk but the keel of the boat is breaking from the surface of the water.
You can also raise the depth of the strut to allow the keel to settle in the water better, and this change will often mean you can push the same size prop or one larger without the hull porpoising. A deep prop raises the keel and a shallow prop lets it settle better.
Hope this helps you out! I've been running boats from .45's to twin .90's for a long time, especially mono hulls, but a few hydro's as well.
Cheers.
:thumb:
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