Is This a "cupped" prop?

[NMShooter]

For my '88 Force 85hp :

072127 (I boat at 6000ft elevation and up)

http://www.propmd.com/c-1057-85-hp-150-hp-single-exhaust.aspx

Thanks!

-f-

 

[Justinde]

Re: Is This a "cupped" prop?

I'd say call them myself. I may be completely wrong, but I thought all props were cupped, just depends as to the amount.

You get your Force to 6000ft? Man, I can only get a couple of feet above sea level on my 125...... she must REALLY fly

 

[12vMan]

Re: Is This a "cupped" prop?

That prop looks to be slightly cupped. Cupping is a curvature added to the trailing edge of the propeller. It is usually very slight, about 1/2 to 3/4 of an inch from the trailing edge down toward the middle of the blade and shaped like the bottom of a bowl. It is used to reduce cavitation and in some cases maximize thrust. Cupping basically makes an inefficient propeller run more efficient. It also affects pitch by effectively increasing it and will reduce RPM.
On the picture you refer to you can see the reflection on the trailing edge that appears to show cupping.

 

[jerryjerry05]

Re: Is This a "cupped" prop?

Yes thats a cupped prop.Some cupping you can see.Some you cant.Most outboard props have some cupping.
The bigger inboard props not.Jerry