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  1. #1

    Join Date
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    OS95 AX vs OS120AX

    Hi, I would like to have an advice here.
    I´m starting a proyect of a Spitfire Mk 22 from scratch, it wil be an 1/6th scale, around 10 to 11 pounds.
    I´m considering using one of these two engines, the price is similiar , so I made some relations between them based on the specifications.
    The props would be 15 x 8 and 16 x 8.

    Taking OS95 AX as "100" to compare:

    Weight: 100 vs 114
    Maximum power: 100 vs 106.9
    Power/Weight (HP/Grams): 100 vs 93.77
    Power/Displacement (HP/cm3): 100 vs 84.63
    MaxRpm: 100 vs 60

    Some other data I dont have would be fuel consumption at given rpm´s

    What would be a better engine option in this case?
    The refrigeration would be somewhat limited by the design (being a scale plane), as I´m considering the cylinder head will be inside the cowl. I will also use a Bisson in-cowl muffler.

    Thanks



  2. #2
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    RE: OS95 AX vs OS120AX

    Either engine, once correctly propped, should be able to fly your airplane. You may need the 1.20 if your model comes out heavier than projected.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com

  3. #3

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    RE: OS95 AX vs OS120AX

    Hi Bill, thank you for your answer! .
    In fact the plane will probably be heavier, somewhere near to 13 to 14 pounds


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