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

[grooter]

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]

A 4 blade will improve your hole shoot but reduce your top end.

 

[Sea Rider]

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

 

[grooter]

Wot rpm 4500

 

[steelespike]

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.