290 SS searay twin 383 strokers

[MTFD23]

Had props gone over and it still spins props while acclerating need to know if I should go to 4 blade or more pitch on 3 blade hubs are new

 

[alldodge]

Welcome, need more info
What are current size and pitch props?

still spins props while acclerating

What do you mean by this?
Your over revving, there is cavitation, something else?

 

[stresspoint]

try using the trim button a bit more , some boats need constant work with the trim button to get the best out of them.

example: i had a 15 foot ski boat with a tricked out F80 four stroke out board.
i was constantly correcting the trim to keep the load on the prop, too much trim and cavitation , to little and the boat went slow, just right and it would chine walk @70+.
the foot throttle and trim buttons on the steering wheel i fitted made the boat so much better to drive.

your 383 s are probably 350 + hp per side so expect some prop slippage on a heavy boat if your trim is not set to suit acceleration.

 

[MTFD23]

Pitch is 21 and I’ve tried trimming it and doesn’t help but if I start slow and it starts to plane then runs fine

 

[alldodge]

Can you post a pic of the transom showing the drives

What is your max speed and rpm at WOT, and does it over rev?

 

[MTFD23]

Can’t show transom it in the water but they are 2006 bravo 1s have not been able to get WOT because of over reving

 

[alldodge]

Can’t show transom it in the water but they are 2006 bravo 1s have not been able to get WOT because of over reving

ok, thanks
Is this a new to you boat?

What props are on it now?

How fast are you going before it gets close to over rev?

 

[QBhoy]

Can’t show transom it in the water but they are 2006 bravo 1s have not been able to get WOT because of over reving

Hi. Don’t suppose these props are stainless and have a venting port system like pvs ?

 

[Stinnett21]

To confirm, this is occurring on both engines?

 

[MTFD23]

3 blade 21 pitch 14.5 diameter and yes both engines

 

[Scott Danforth]

I think you need more pitch

 

[MTFD23]

I was thinking 4 blade with 23 or 26 pitch

 

[alldodge]

You said it spins while taking off, and still have not said what that means.

4 blade 23 equals a 3 blade 25
A 4 blade 21 equals a 3 blade 23