I run a Pioner Multi - http://www.youtube.com/watch?v=taxbEfO33NI&feature=results_main&playnext=1&list=PLEBB3BF29734F1CB2 This is running a BF50 Honda with 11 1/4 x 13 prop, it cruises comfortable at around 15 knots and I have only had it up to 18 knots as you keep getting cavitation if ...