What is the best shape of the sail?

What size prop should i use on a 115hp 16' boat? How did you-Boats violate international law? Is it worth buying a used outboard motor? Why does my jet ski start and run and idle and rev just fine out of water but wont rev in the water and has no power in the water? What prevents the ignition of gasoline fumes when the inboard engine backfires on a boat? Do cruise ships have to have lifeboats for everyone on board? What signal tells another boater that you wish to pass on your port? Rhymes with boat to keep dry? What is the negative effect on nuclear submarines? How old is a mercury 85 HP Blue Band outboard motor serial number 4294803? How much gear oil goes in a 125 hp mercury outboard? Who invented ship and in which year? What shoud you do avoid capsizing or swamping? What is the approximate weight of a 1993 mercury 25 HP outboard? How do ballast tanks work? Is sailing downwind the fastest point of sailing? How does a periscope on a submarine work? When should you discard a pfd? Was submarines used after WW1? What do lateral markers indicate Boating?