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  1. #1

    Join Date
    Sep 2006
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    OS 55 and 15x4 Zinger Pro

    OS 55 and 15x4 Zinger Pro Engine has been broken in using OS proceedure; with about 6 flights
    of about 5 min duration. I think it was set up a little richer than normal. Obtained 8900 but very
    sure it will be higher when fully broken in. It is mounted on an Sig Kadet Senior Arf with a
    Dave Brown mount. Took a fair amount of filing on various places to get it to fit.

  2. #2

    Join Date
    Jan 2005
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    Rancho Murieta, CA
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    RE: OS 55 and 15x4 Zinger Pro

    Wow thats a lot of prop. Unless you are trying to keep the prop noise down, there may be a better prop. Allow me to suggest some comparison data:

    ......type..........size...........RPM..........HP .........lbs. Thrust cor. for fuse drag.......Pitch speed MPH..........................Muffler

    -Zinger Pro----15X4-------8,900------.91--------------------7.07--------------------------33.7-------------------Stock /w baffle
    ----APC-------12X5------12,900-----1.44--------------------7.90--------------------------61.0-------------------Stock /w baffle
    M.A. (S-2)----12X5------13,800-----1.40--------------------7.74--------------------------65.3-------------------Stock /w baffle
    ----APC-------12X5------14,600-----2.09-------------------10.12-------------------------69.1---------------Jett Stream muffler

    Static, on the ground numbers.

    Note the near double pitch speed with another prop.
    Oooh eee oooh ah ah(the crowd) ting tang walla walla bing bang!(the plane crash)

  3. #3

    Join Date
    Nov 2005
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    Floroe, NORWAY
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    RE: OS 55 and 15x4 Zinger Pro

    If you want performance you better not follow OS`s advice on props, they always advice WAY to big props. You have your engine struggling with a too big propeller and may possibly fry due to heat build up. It would be much happier if allowed to rev 10K and upwards

  4. #4
    skiman762's Avatar
    Join Date
    Dec 2005
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    RE: OS 55 and 15x4 Zinger Pro

    Way too much prop 8900 is way to low for that engine
    land of the FREE: you\'re free to get a JOB not a handout.
    home of the BRAVE: they paid for it and you\'re enjoying it

  5. #5

    Join Date
    Oct 2004
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    Lehi, UT
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    RE: OS 55 and 15x4 Zinger Pro

    The 55AX does seem to be very happy at 10,000 rpm, dont think I would run it any lower.


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