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OS95 AX vs OS120AX

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Old 07-10-2011, 10:42 AM
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DanielOldani
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Default 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


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Old 07-11-2011, 05:58 AM
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Bax
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Default 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.
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Old 07-12-2011, 04:38 PM
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DanielOldani
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Default 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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