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  1. #51
    flyer1966's Avatar
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    RE: OS AX 46 needs more power

    I took my Viper out today and flew it with a master airscrew 9.5 x 6. I was getting right at 17000 rpm static using my 20/20 YS fuel. Airplane seems to be moving pretty good. I bought an old FX 46 off EBay.  I will compare the two once I get it.

  2. #52

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    RE: OS AX 46 needs more power

    Lift/shim the liner 0.025 "
    Lap piston to liner
    Remove the baffle inside the muffler
    Reamout the stinger on the muffler, but dont break through
    Bore out the carby within reason
    Polish the crank flute
    Radius the crank flute opening/leading edge
    Run the merlin glowbee style plug
    Polish the head chamber with scotchbrite to remove any varnish/carbon build up, do the same to the piston top
    Cool power 15 - 20% nitro & syn oil - no castor
    APC pylon prop 8.8x8.75 balanced

    Just for starters -

  3. #53
    speedracerntrixie's Avatar
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    RE: OS AX 46 needs more power


    ORIGINAL: flyer1966

    I took my Viper out today and flew it with a master airscrew 9.5 x 6. I was getting right at 17000 rpm static using my 20/20 YS fuel. Airplane seems to be moving pretty good. I bought an old FX 46 off EBay. I will compare the two once I get it.

    Get rid of that prop and throw on an APC 9X7 sport prop and it will be even faster.

    Of course it's true, I read it on the Internet.

  4. #54
    flyer1966's Avatar
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    RE: OS AX 46 needs more power

    I will put a 9 x7 on it and check it next time out.

  5. #55
    flyer1966's Avatar
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    RE: OS AX 46 needs more power

    Scoeroo thanks for the info.

  6. #56

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    RE: OS AX 46 needs more power

    I work on rossi's mainly but dabbled in OS's here & there
    If you want....send it to me and i will work onit for you,
    I have a rossi from a gentleman in england i have to finish off first -

    Regards-
    Grant

  7. #57
    flyer1966's Avatar
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    RE: OS AX 46 needs more power

    Grant here is my email fosterp51@yahoo.com. Shoot me an email when you get time with your info.

  8. #58

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    RE: OS AX 46 needs more power

    Witht those mods, your motor will be illegal for racing.
    Dave Norman
    29w

  9. #59

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    RE: OS AX 46 needs more power


    ORIGINAL: BiggerDanno


    ORIGINAL: daven

    The OS AX .46 is faster the OS FX .46, well documented in our area as we have been racing those motors for somewhere around 15 years.

    Ignore your RPM / PITCH calculations, I won a ton of races using a standard APC 10x7 Sport Prop.

    A couple of the APC pylon props do work, I believe many of them are using the 9 1/2'' x 8.5 N (Single N, not double NN).

    Good luck.
    I don't think the AX has been around 10 years, much less 15.
    My experience with both has the FX faster on top end, the AX torquier at lower rpms.

    We use to race the FX, when the AX came out both were legal, but it didn't take more than a couple years before people were getting rid of their FX's and buying AX motors to race in our area because it was faster. The trick with it was to use a heavier prop to load the motor in the 14,000 - 14,500 rpm area, both acceleration and top speed were/are superior to the FX.

    D
    Dave Norman
    29w


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