Joined today since every time I go looking for RIB info I seem to end up here anyway.
I have a 4.8m Chinook that I've put 2 Yamaha 55s onto. The (common?) 13" pitch prop took revs right up to the top end, but without much extra speed. I've put a 17" pitch prop on the starboard engine, which has given increased top end speed, but I now have a lot of water splashing over the transom.
I will adjust trim to see if things improve, but if someone here could explain the science behind prop/cavitation plate/hull relative positions I'd be very grateful.