3 Blade vs 4 or 5 Blade Prop Comparrison
07-08-2007, 10:11 PM
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Join Date: Apr 2007
Location: Williamston / Grand Haven, MI
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3 Blade vs 4 or 5 Blade Prop Comparrison
I have a 28' Checkmate with 29" labbed Mirage Plus props. In the search for more speed I am considering going to a 4 or 5 blade prop. Currently the boat runs 80 MPH on GPS at @ 4900 RPM with a lite load. Full of fuel and people the boat runs 77 MPH at @ 4700 RPM. The engines are stock 502 MPIs which have the rev limiter set at 4900 RPM but I do not think the limiter is currenly being touched with these props. I would like to know what pitch would give a similar engine RPM with 4 blade non labbed Bravo 1s or non labbed Hydromotive 4 or 5 blade props. Thanks.
07-09-2007, 07:50 AM
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The 502 needs to run at 5000 RPM so your pretty good there. Your labbed 29P runs similar to that of a 27P stock in a 3B configuration. So in a 4B you would need a 26P and a 25P in a 5B. But the deciding factor will be your drive heigth as to whether you can run 4B and 5B props successfully. The deeper your prop shaft the lesser the blades.
Julie
Julie
