[kevj]

Hi,

I've currently got a 9 1/2" x 9 1/2" Prop on my engine in need of replacement - pieces missing from the tips of the blade.

I've seen another Prop which is 9 1/4" x 11" Obviously the dia of the blade is 1/4" less than what im running, but the pitch is greater.

What effect will a greater pitch have on my engine? Will it over/under rev? will it overheat the engine? will my top speed be reduced?

Any help will be much appreciated!!

Thanks
Kevj

 

[ChrisP]

Increasing the pitch by 1 inch reduces your engine revs by 200 as a rule of thumb
you are also reducing the diameter so this should increase the engine revs slightly. Best thing is to try it on the water. If your engine fails to reach the maximum rev range at wide open throttle the prop is not suitable.

At a guess the boat will be a bit slower with the new prop. Why not have the existing prop repaired? Keep the other one as a get you home spare.

What engine have you got a Merc or Suzuki?

 

[kevj]

Chrisp,

Thanks for the info. Will repairing the prop be cost effective? Its a Suzuki btw.

Kevj

 

[ChrisP]

It would cost you about £40 for a repair