Understanding Motor and Gearbox Design - Instructables i have a 44 ft long wooden boat that i made it by myself . the boat beam is 15 ft and hull depth 9 ft displacement is around 22000 lb . the boat is powered by two volvo penta AQAD40 marine diesel engines that produces each 165 hp and a max of 3000 rpm . i need to install 2 gearboxes could you pls advise about the best ratio suitable for Events | Institute for Translational Medicine and Therapeutics Symposia. ITMAT symposia enlist outstanding speakers from the US and abroad to address topics of direct relevance to translational science. Read more