Originally Posted by codprawn
Props just aren't suited to gearboxes. That's why planes use variable pitch instead of change gears.
Is this for acceleration? Essential for a plane even on water (anyone got a flying boat? I'd like a go - Free self contained accommodation for 2 in the Isle of Man for 100th anniversary TT celebrations in June to the lucky winner)
Once the boat speed is achieved at 4/5ths open throttle, wouldn't a higher gear drop the engine revs and maintain prop revs assuming the engine has the torque to manage the gearing?
You'd lose reponsiveness if the speed over water and engine revs drop - current, headwind etc - so perhaps an automatic/autopilot/cruisecontrol combo is required. Come on AquaTechs - sort it out not just for top end sunseekers - I bet a widebody 7mCoastline would be perfect - top cruising speed at 1/3rd throttle, extended range...