Added 2.5" Shorty Prop Ideas?
 

Added an Alpha SS drive two months ago. It's 2.5" shorter than a standard Alpha/Bravo. Propshaft is 3-3.5" below pad.
Picked up 4mph @ 500rpms @ WOT Lost 5-6mph at cruise speeds.

Boat is an 84 Hammond Challenger MKII 21' pad bottom 22* deadrise V. 2600lbs wet
Engine is a 385ci SBC with arond 450-475HP.

With a Hydromotive labbed 14 5/8" 23p 3 blade TRS cleaver I have ran a best of 78.2 GPS @ 5900-6000rpms which is 9-10% slip.

Boat handles great and acceleration is awesome but only at higher speeds. Planing is decent and I can still pull kneeboarders but low speed cruising and turning is non existant. Anything under 3K rpms I have major blowout and cavitation. Even hitting some larger waves will cause the prop to blow out.

I mainly want a prop that has better low speed charachteristics w/o sacrificing any topend. Is it possible?

Some more insight for ya.
 

http://www.donzi.net/forums/showthread.php?t=54178

I had good luck with the Turbo 2+2 prop with the S.S. on a 22' Donzi.
You can contact Big Grizz on that site for props also !

DONZI, Thanks for link. Good info.

Here's a few vids of the boat running. Again, topend is awesome.

http://www.youtube.com/watch?v=fyKTq...eature=related

http://www.youtube.com/watch?v=Ho1XU...eature=related