ok guys here we go. the boat is 40' rabco cc with twin 225 optimax with those offshore master low uints(gry color ones. the rpms can go to 5700 to 6000 with a 15x19 i have a set of mir plus 15x21 is this better or will i hurt my motors. both motors were rebuild have 20hrs on them. the boat is heavy and i do alot of offshore fishing with it. the speed now goes 50mph at5000rpm.

thank you

capt. trif

21 is the wrong direction from 19 if you are trying to get more RPM, but 17 seems low for such a big boat, if you can borrow a set of 17's from someone it is worth a try.

not looking for more rpm. looking to push more water. had 17 didnt go anywere put the 19 moved the boat trying to get theback end up and move more water when offshore.

thank you

capt. trif

I have a boss hammer 21'6" I JUST PUT IN A 502 WITH 500HP
WHAT PROP WOULD WORK FOR MAX SPEED, WHEN I HAD MY 454 310 HP MOTOR THE BOAT RAN 64 GPS WITH 4 PEOPLE AND A HALF FULL TANK OF GAS. tHE PROP I HAVE IS A 23P.