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prop 55ax at 4500 feet

Old 07-17-2012, 05:35 AM
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jeffk464
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Default prop 55ax at 4500 feet

What's the best prop size for all around power on a 55AX at 4500 feet elevation. Looking for good vertical but not hovering.
Old 07-17-2012, 04:08 PM
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jimmyjames213
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Default RE: prop 55ax at 4500 feet

11x5 is what i would try first
12x4 next
Old 07-17-2012, 07:16 PM
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freakingfast
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Default RE: prop 55ax at 4500 feet


ORIGINAL: jimmyjames213

11x5 is what i would try first
12x4 next
Yes!
Also try 11X6 APC and Master Airscrew 11X7 (S-2 Series!!!)
Old 07-29-2012, 10:59 AM
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jeffk464
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Default RE: prop 55ax at 4500 feet

Checked my RPM again on the 13X6 and was only pulling 9800-9900 rpm. I really need to drop the prop size.
Old 07-29-2012, 11:02 AM
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jeffk464
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Default RE: prop 55ax at 4500 feet

Checked my RPM again on the 13X6 and was only pulling 9800-9900 rpm. I really need to drop the prop size.
Old 07-29-2012, 05:37 PM
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Default RE: prop 55ax at 4500 feet

I usually run a 12 x 5 on mine at 5000 feet and it works great. Play around with a few. Keep in mind these engines need 20% oil with some of it castor. Make sure the engine is well broken in, which can take a while on these. I would run 15% nitro at your altitude and an OS8 plug as well.
Great engine, I love all of mine, the stock ones and the modified ones.

Good Luck
Scot
Old 08-27-2012, 07:10 AM
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Default RE: prop 55ax at 4500 feet

At the Saratoga Springs field, I got 10,550 rpm's with a 12x6 APC. That was in a Cub, flew it great.

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