Changing form a composite to a Stainless prop

[Kwzskydive]

I recently purchased a boat that has a 4 bladed piranha composite boat proper on it. I am happy with the performance and is in the correct WOT RPM range for my set up (4800 RPM). The question I have is has any one had any experince changing from one of these 4 bladed composite to a 4 bladed SS prop? Is there a considertaion to the pitch due to the deflection of the composite blades?

 

[bnicov]

Re: Changing form a composite to a Stainless prop

Check with your local prop shop or marina. They may loan you a prop on the condition that you buy from them. You'll be much happier with a SS prop or even an aluminum over the composite.

 

[steelespike]

Re: Changing form a composite to a Stainless prop

If you give us the info requested in the stickys at the top of the prop forum.
We can tell how you're doing with your present setup.

 

[Kwzskydive]

Re: Changing form a composite to a Stainless prop

4 bladed piranha composite
14.5x16
4600 Rpm at 32 MPH GPS
4.3l Mercrusier Bravo 1 1989
Sea Ray 220 Sundancer 1989 23'9" 4200Lbs

 

[halfmoa]

Re: Changing form a composite to a Stainless prop

I recently purchased a boat that has a 4 bladed piranha composite boat proper on it. I am happy with the performance and is in the correct WOT RPM range for my set up (4800 RPM). The question I have is has any one had any experince changing from one of these 4 bladed composite to a 4 bladed SS prop? Is there a considertaion to the pitch due to the deflection of the composite blades?

I'd humbly suggest you adhere to the "If it ain't broke, don't fix it." school of thought.

 

[Kwzskydive]

Re: Changing form a composite to a Stainless prop

I'd humbly suggest you adhere to the "If it ain't broke, don't fix it." school of thought.

I would normally agree with you but in this case the composite prop look very weathered I know the affects of UV on any type of petroleum based material and I am concerned about a failure of the prop.

 

[steelespike]

Re: Changing form a composite to a Stainless prop

I have the gear ratio at 1.65.It may be stamped on the leg.
The calculator says 24% slip There is no doubt that a ss prop will lower the slip.
Its nearly impossible to predict results when changing materials and your changing design as well.
I think I would stay with a 16" pitch..Don't worry about diameter if intended for your application diameter should be right.

 

[halfmoa]

Re: Changing form a composite to a Stainless prop

Fair enough.