Prop size on a F60 Yamaha - 4.55 Quintrex Coastrunner
Posted: Tue May 04, 2021 7:07 pm
My usual prop is a 11 5/8 X 11G Alloy (standard 60 Yam)
WOT 5400rpm 41kmh on almost 4 trim (if I go to 5 it sucks air)
Spare prop is 11 5/8 X12G Alloy
WOT 6000rmp 43kmh on 4 trim
will cruise on 33kms at 4400rpm
Logic tells me that swapping to higher pitch 12, should of made WOT less than 5400 (ie should of been harder to get there), but it got better to about max 6000 - 6100 rpms. I only gained 2kms per hr more & it spins faster. Pickup is way better to get on a plane.
Boat 2000 Quintrex Coast runner 4.55 with full windscreen. Alloy prop cause I ding them.
I raised my motor up years ago and cannot recall what increase I got at that time, but it was better.
My top plate on yamaha is out of water by an inch. Cavitation plate still under water.
But maybe I need to drop it back?
Mate has a Stacer 4.55 side console with yam f60 & same 11 5/8 X 11 pitch prop & he gets 52kmh WOT
I know Its holden & fords all over again
* So therefore Should I go back to the 11pitch & cruise at just under my WOT which is way under the 6000 max rpms at 5400 to get better speed & economy.
What other prop options do others have, I'd like to try smaller / bigger props to find the happy medium for my boat, so are looking for what you have on similar size boats / motors to narrow my many choices.
Pic is motor at 4 trim angle, best speed before it sucks air.