My Resue minor runs a 30 hp Beta with 1.5:1 transmission , Prop is 11 inches by 7 in pitch with maximum amount of cup. Top speed with 2 persons aboard is 14.5 Knots 3600 rpm, Best cruise speed is 12.5 knots at 3300 rpm. Note that my boat is 6 inches wider than the original design. Had moderate prop ventilation in choppy water but maximum cup has improved this considerably.