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-   -   Prop for high altitude? (http://www.wakeworld.com/forum/showthread.php?t=797893)

Bakes 05-01-2013 5:55 PM

Prop for high altitude?
 
So we are moving to CO this summer. I have a 98 tige 2200v with about 300+ hp or so. No problems with power at sea level in WA state or down in Louisiana. We took it to bear lake one year and I cold not believe how gutless it was.

Short of buying a new boat or getting a bigger engine, what are my options? Specifically, what recommendations for a prop? We do an even mix of skating, wakeboarding, slalom and hydrofoiling. I ski at about 34 MPH.

Thanks

Bakes

Dmac420sj 05-01-2013 7:23 PM

I run the acme 911 in elevations but might be lil much for you. But at 7000' with 2k in ballastt it's a beast! Then again I don't ski,I think my top speed is around 37 mph.

rallyart 05-01-2013 9:53 PM

You will be able to hit past 34 with most props. I don't know what your drive ratio is but if you want a quick guess on prop size: At 5000' you are down over 20% in power due to the thinner air. You can pick up that 20% by taking it off the pitch. If you have been running a 13" pitch you drop 2.6" off the pitch putting you at roughly 10.5. You've dropped you theoretical top speed by 20% also so if you used to do 44 you now do 35.
There is a lot more to it than that but it will get you close. In essence the lower pitch gives you torque multiplication to get similar acceleration.

johnny_defacto 05-01-2013 10:34 PM

I had the same boat and used the ACME 515. It is a 3 blade, 13 x 12 x 0.080 Don't let the pitch fool you, it was very smooth (thanks to the .080 cup, i think) and it had a good top speed of 45 ish?? I ran approx 3200-3600 lbs of ballast in it with that prop and the 315 with throttle body injection. I took it up to 4000+ elevation with that ballast and it did fine there as well.

bruizza 05-02-2013 7:51 AM

I live in Colorado and use the Acme 1235. I have an RZ2 with the 343 PCM and 2k in ballast.

scotthons 05-02-2013 8:09 AM

I had to upgrade to the OJ 14.25 X 14 for our elevation which is 6,000 ft. The prop does a lot better than the stock which I believe is 13 X 17. That one could barely get on plane. The new one gets up pretty quickly. The max ballast we run is 2400lbs. Top speed is maybe 35 though.

superair502 05-02-2013 8:26 PM

Not sure about your fitment but I have the acme 1235 prop I am selling for 375$ I think it is like a 600$ prop. I have only used it like 30 hours and perfect condition. I think it is 14.25x14.25 and I can yank about 4500 lbs and wedge out of the water on my axis with the 335 motor

superair502 05-02-2013 8:27 PM

Also I am about 400 ft above sea level. Colo would be more but that prop would be prefect if u were running about 3k in ballast and can still hit like 40mph. Axis calls it the high altitude prop lol


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