RE: nitro boat white heat v
Have you tried to mount a flywheel, and drive collet on your STS .28 marine engine yet? I saw those on eBay, and they have the SG piloted shaft meant for a 1/8 scale car/buggy clutch. Not sure you will be able to mount a flywheel/collet on there, the threads are too short. ANother problen is this engine's slide carb. It's easy to overcome in a wide, vee or mono hull, but theres not much room for a bellcrank throttle assembly in your hydro there.