3or4 blade..... Stainless or aluminum.....

grooter

Cadet
Joined
Jul 30, 2013
Messages
9
1990 Donzi 22 ft open boy 5.0 ltre Omc cobra outdrive..... Flat out 38 maybe 40 by myself...... Would love a little more out of it
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
15,417
A 4 blade will improve your hole shoot but reduce your top end.
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Flat out 38 maybe 40 by myself......

Is that per GPS or is an assumed number ? What about max wot revs achieved at that speed ? Can't play with props if you don't know max rpm and if inside min-max safe rpm range for that engine.

Happy Boating
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
We need your prop size, near the base of the blades or under the prop nut, hp and or gear ratio.do a lightly loaded wot run get us the accurate rpm and gps speed.
 
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