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  1. #1

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    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.

  2. #2
    jimmyjames213's Avatar
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    RE: prop 55ax at 4500 feet

    11x5 is what i would try first
    12x4 next
    Anything worth doing.............is worth overdoing

  3. #3

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    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!!!)
    Oooh eee oooh ah ah(the crowd) ting tang walla walla bing bang!(the plane crash)

  4. #4

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    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.

  5. #5

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    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.

  6. #6

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    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
    Revver Brother #260

  7. #7

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    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.
    Club Saito #803


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