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OS 75 AX or OS 91 FX - Which is better as a pusher ?

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OS 75 AX or OS 91 FX - Which is better as a pusher ?

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Old 10-22-2008, 09:35 PM
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BalsaBob
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Default OS 75 AX or OS 91 FX - Which is better as a pusher ?

Plan on buying an OS 75 AX or an OS 91 FX for a pusher (aircraft will weigh approx 7.5 lbs and has a 60 inch span). The 75 AX is ABL ..... the 91 FX is ringed. Is one better than the other as a pusher ?

Thanks. Bob
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Old 10-25-2008, 01:58 AM
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patzane
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Default RE: OS 75 AX or OS 91 FX - Which is better as a pusher ?

what pusher plane are you looking at. If it's the bobcat by NitroPlane that 91 is to big
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Old 10-25-2008, 06:34 AM
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Default RE: OS 75 AX or OS 91 FX - Which is better as a pusher ?

If it's a NP Bocat you're planning on mounting the engine on,....I've ran a Tower .75 and a Magnum .91 on one of my Bocats,...and had better performance with the .75 than the .91.
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Old 10-25-2008, 10:31 AM
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Default RE: OS 75 AX or OS 91 FX - Which is better as a pusher ?

You might want to look for pusher props before making a decision. Also a Bob Cat by NitroPlanes will likely weigh over 8 pounds. I have two.

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Old 10-25-2008, 11:20 AM
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Default RE: OS 75 AX or OS 91 FX - Which is better as a pusher ?

Bigger engines require bigger propellers. Ground clearance is an issue at takeoff and landing. Also pusher prop sizes are limited.

Regards,
Bart
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