Prop Slip on a 36
 

What kind of prop slip numbers can I expect on my 36...

I'm seeing what I believe to be an insane amount of slip

28 pitch bravo 1 4 blade props reworked to 29's spinning 4100 RPM = 60 MPH = 20% slip
32 pitch bravo 1 4 blade props spinning 4000 RPM = 60 MPH = 26% slip

Will adding some cup to these get the slip down?

I don't have any WOT numbers...
I did make one short run to 5000 RPM with 29's and was right at 70 MPR or 24% Slip

What are you guys seeing as far as slip on your 36's?

Thanks

Are these props all reworked? One more question if you put + trim in it will the motors run away? Have you ever had new propellers on the boat?

Yes I believe both sets to be reworked. I have not had new out of the box props on the boat...

I can trim pretty high before they blow out it thats what you mean..

As I trim up RPM gradually rises and speed increases.. Max speed at 4000 RPM, is at around 3.5 on the drive indicators.

How about a little two sided tape on the leading edge of the prop , you never know might work .
Cheers RG .

Never heard of this trick... Will it actually stay there?

No just having some fun . I have the same issue propping my flat deck cig. Don't know wether to reduce diameter or move up in pitch , it's an art not a science . RG.

You need to try props that aren't reworked till than you wont know.

I am running about 18% slip with my 36'. My props were labded by BBlades. Make sure your RPM and speed are accurate before you run your slip calculation.

Can you tell me where you are? Speed pitch horsepower!!

I know these boats are heavy and not so efficient, but even 18% seems high.

Wonder if that's the norm??

Anyone else?

If you have "reworked" props you really don't know what you've got. Try some props that haven't been "reworked" to come up with some more accurate numbers.