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Old 10-18-2008, 09:11 AM
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Originally Posted by daredevil
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
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Old 10-18-2008, 09:13 AM
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Originally Posted by I'CE
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 ! ps: ya ya ya it's a SKATER NATION
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!
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Old 10-18-2008, 09:36 AM
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Originally Posted by I'CE
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 ! ps: ya ya ya it's a SKATER NATION
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 ?!
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Old 10-18-2008, 12:14 PM
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I think its supposed to be 1.154 trans ratio.
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Old 10-18-2008, 12:33 PM
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Originally Posted by Griff
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.
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Old 10-19-2008, 08:56 AM
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Originally Posted by Griff
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.
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Old 10-19-2008, 06:35 PM
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Aren't high slip #'s the norm on Surface drives ????
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Old 10-19-2008, 08:41 PM
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They shouldnt be !?
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Old 10-23-2008, 09:35 PM
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Originally Posted by daredevil
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
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Old 10-28-2008, 07:35 PM
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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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