Need advice on more aggressive prop for my situation

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,961
Maclin, glad you got 'er worked out.

Not wanting to latch onto your thread, but what is the ratio that you are referring to? Is there a calculation I need to do before switching props?

I just replaced my 3 blade 21P aluminum with a 4 blade 18P SS based on input from someone that had the same model/engine set up. Huge difference in performance (bow drop went from 8 seconds to less than 4, less likely to blow out, and no blow out due to mild side waves). I gave up about 3 mph... but still hitting 52. I'm hitting about 4900 at WOT (range is 4800-5200 on the 350Mag).

What were your rpms with the 3 blade 21 AL?
 
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