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Hydro 5 To Bravo I Rpm Diff!

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Old 06-06-2002, 06:18 PM
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Exclamation Hydro 5 To Bravo I Rpm Diff!

Just got done doing some back to back testing from a Bravo I 4 Blade to a Hydromotive 5 Blade. The rpm difference from pitch to same pitch is approx 500. The 5 blade will turn less rpm then the Bravo I. The slip factor in the boat decreased dramaticly when the 5 blade was run after the Bravo I. So if you are turning a 32 P Bravo I at your recommended RPM you need to run a 29 P Hydro 5 blade approx. Every setup will vary slightly in RPM and PITCH.

Last edited by Goodfella; 06-06-2002 at 11:16 PM.
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Old 06-06-2002, 06:38 PM
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Please give us the details such as what kind of boat, how much H.P., any speed differences and what kind of X-dimension.

Thanks,
Dave
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Old 06-06-2002, 06:38 PM
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Mike, Very interesting, What happened to the MPH? can you post the numbers? RPM, Gear Ratio, etc. Slip.
Philip
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Old 06-06-2002, 06:48 PM
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goodfella, I thought of trying them. i run a 32 bravo on xr drives w/ 650 hp I tryed to turn a 34 and the boat handle like sh$$ and lost m.p.h and only could get 5100 out of it. the 32 puts me off the limiters. what do you recomend? i havent spoken to dennis yet. thanks for your advise.


p.s 37 outerlimits w/ stagered motors
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Old 06-06-2002, 11:27 PM
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Here is all the info I have:
37 Active Thunder
Twin 675 KE SBS

outer37, You should think about trying a set of 30 or 29 Hydro 5 if you are running 32 Bravo I at your recommended RPM.

Philip&Bigwavz,as soon as I get the authority to release more info I will.
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Old 06-07-2002, 12:35 AM
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Sounds like ThunderDan! What speeds?
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Old 06-07-2002, 01:29 PM
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Default Single cat results/

Mike,
If and when you ever get some results on a high x single cat please post it. I may have the opportunity to "borrow" a 28" hydro 5 in a month or so. running a labbed 30 now with 10.5% slip (best conditions not duplicated every day)

Thanks,
Cat
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Old 06-07-2002, 01:39 PM
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We tried the 31p 5 blades, could only turn them 4500 rpm's at 88 mph. It is looking like we need some 28p 5 blades. These are KE 675's, bravo xr's with 1:36 gears, slip was about 9.5. The boat did really like the 5 blade props though.
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Old 06-07-2002, 02:10 PM
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Great info! Keep it coming on the Hydro 5's.

I think they may be the ticket for the high X on my cat and they sure would make a nice Xmas present when the time comes!
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Old 06-08-2002, 12:41 PM
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Thunderdan,
Thanks for the info Hydromotive is supposed to release the 26-29 pitch versions sometime in July. I will let you know Thanks for stopping by and checking out the faciltiy.
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