hi guys,
i have a 15ft, deep-v RIB with a tohatsu tldi 115. The prop is aluminium 13,25X17, and i've seen @5800 rpm (max) 37 knots, while @4000 rpm 22-25 knots. With 2nd person on board and extra stuff for camping etc it maxes out @5400 rpm and 34 knots. I have no problem whatsoever with this...