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.

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

Mike, Very interesting, What happened to the MPH? can you post the numbers? RPM, Gear Ratio, etc. Slip.
Philip

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

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.

Sounds like ThunderDan! What speeds?

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

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.

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!

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.