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-   Prop Talk (https://www.offshoreonly.com/forums/prop-talk-165/)
-   -   Surface Drive Prop Rule (https://www.offshoreonly.com/forums/prop-talk/193178-surface-drive-prop-rule.html)

Car Biz 10-18-2008 09:11 AM
Originally Posted by daredevil (Post 2718856)
I think thats with i questimated ?! LOL ( the prop size)

I would also think a 18X28 , and go from there .

But the slip # came down to 12% which is not bad at all !
Thanks for the help DD:ernaehrung004:

Car Biz 10-18-2008 09:13 AM
Originally Posted by I'CE (Post 2718975)
Bill, how are ya doin ? Thanks for the est. same set up as car-biz except kamma drive 18% over w/ 1:54 trans 17x23 prop 33-Sutphen seen 80+ what are u-fig. on the slip and @ say 5600 what is your est. mph daredevel jump in if u-wish thanks guys ! :drink: ps: ya ya ya it's a SKATER NATION :ernaehrung004:
ICE i have my 16-1/2 x 24's i need to get rid of if you know someone look give me a shout!

DareDevil 10-18-2008 09:36 AM
Originally Posted by I'CE (Post 2718975)
Bill, how are ya doin ? Thanks for the est. same set up as car-biz except kamma drive 18% over w/ 1:54 trans 17x23 prop 33-Sutphen seen 80+ what are u-fig. on the slip and @ say 5600 what is your est. mph daredevel jump in if u-wish thanks guys ! :drink: ps: ya ya ya it's a SKATER NATION :ernaehrung004:
There is now way you seen 80+ with that prop and ratio, if so you turned your engine at almost 7 K ?!

Around 69-70 Mph @ 5600 ,with that prop and ratio .

What engines do you have ? Your slip# is bretty good !
But you need a bigger prop ?!

Griff 10-18-2008 12:14 PM
I think its supposed to be 1.154 trans ratio.

Car Biz 10-18-2008 12:33 PM
Originally Posted by Griff (Post 2719161)
I think its supposed to be 1.154 trans ratio.
my twin discs are stamped 1.54 right on the tranny. My drives are 1.1. With Kammas you can change gear sets in the drive for overdrive or underdrive.

DareDevil 10-19-2008 08:56 AM
Originally Posted by Griff (Post 2719161)
I think its supposed to be 1.154 trans ratio.
In ICE's case i agree if he seen 80 + befor. LOL

then he would of seen them at around 5000 RPM with a 14-16 % slip.

DONZI 10-19-2008 06:35 PM
Aren't high slip #'s the norm on Surface drives ????

DareDevil 10-19-2008 08:41 PM
They shouldnt be !?

I'CE 10-23-2008 09:35 PM
dd
 
Originally Posted by daredevil (Post 2719090)
There is now way you seen 80+ with that prop and ratio, if so you turned your engine at almost 7 K ?!

Around 69-70 Mph @ 5600 ,with that prop and ratio .

What engines do you have ? Your slip# is bretty good !
But you need a bigger prop ?!
twin 548ci 645hp dyno and thanks 4-the responses :cool:

bbladesprops 10-28-2008 07:35 PM
Surface drives give high slip numbers on most hulls other than extremely efficiant hulls. ie catamarans. People will argue that but I see it every other day. They do have their advantages though.

Keep the 17x29 4 blades and let us have a crack at them. I know we can improve the slip and speed numbers.


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