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Thread: 25FX


  1. #1

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    25FX

    Can someone give me a few real tach numbers to look at?

    25FX with what fuel and prop please???

    I ran one today with a 9x6 wood prop and got 12,600 rpm, with a pinch test peaking at 13K. Is this engine producing the correct power, or not?

    My intent is to use this engine on a 3D profile plane, likely with a 10x4 APC prop.
    Airplane Pimp

  2. #2
    oceansfiftyseven's Avatar
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    RE: 25FX

    10x4 mas 13,500
    9x4 mas 14,400
    8x6 3-Blade mas 13,800
    These numbers are using Powermaster 15%
    I have tried the apc 10x4 on this engine and it was not happy. It does like the mas 10x4 though. Must be a lower load on the engine.

  3. #3

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    RE: 25FX

    Thanks for the numbers. I feel like mine is a bit low, but not horrible.

    Any one else?
    Airplane Pimp

  4. #4

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    RE: 25FX

    OK, I'm feeling better. I ran an APC 10x3 and some good fuel.

    I can get 14,700 rpm, if I want to. I'll likely try to fly it a hint softer than that, however...

    The 9x6 TF prop must load quite a bit heavier than the APC 10x3.
    Airplane Pimp

  5. #5
    SeamusG's Avatar
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    RE: 25FX

    brand new OS 25 FX (3 tanks of 15%) with MAS 9x4 G/F G-3 nylon prop and AirScharnell Combat can (engine is running a bit rich and the can has not been tuned)
    18,100 - 18,200


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