prop size?

[maxum]

can you tell me the best size prop for my boat?.

i think im under prop .(is that what you call it) it revs to much and not that fast.

i just put in a 5.7 350engine new not run yet. so i will like to do this job the same time
and stop the over rev.i cant tell the size is on it now.drive is alpha one gen 2.

2300sc maxum,thanks.

[Jango]

We need to know:

1. size of boat - length, width, bottom shape (deepV, flat or somewere inbetween)
2. Total weight w. one passnger (driver) half tank of fuel.

3 Brake HP @ what RPM

4. Final Drive ratio

Whatever else you can tell us will help.

Jango

[maxum]

ok its 24 foot about 2000lbs ,3foot draft, hp260 engine 5.7 vortec q,jet carb
alpha one gen2 drive.me my wife and my 2 kids

[maxum]

width about 8 foot.

[Jango]

I believe your total weight of 2000 lb is a least 600-800-lb low. The motor/outdrive alone is more than 900 lb.

Without more precise details it is difficult to recommend an exact Prop.

Based on similar applications, I would suggest a 14 or 14 1/2 x 19 P. 3 Blade prop. I believe a 21 pitch will probably not allow adequate max RPM. (4400)

[Jango]

Just figured prop requirements for a boat similar to yours:

1. 24' planning hull, 3000# w. Driver only and half tank fuel.

2. 260BHP mercruiser @4400rpm (5.7L)

3. 1.5 gear ratio

Calculated to 15 1/2D. X 17P Full Cup, 3 Blade (.55 D.A.R.) w.10%slip - Max Speed, 44 MPH

[maxum]

hmm i see.hull spec is good for 50mph.got it out today prop size,4878120a40 19p.?

[Jango]

Weight is extremely important in determining Prop size. If boat with Driver only, with minimal fuel was 2400 lb, prop size will be 15 1/2 D x 19 P. Full cup w.10% slip. Max speed 49.2