Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

What Prop for S91FX

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Old 08-09-2007, 05:51 PM
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Dig it
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Default What Prop for S91FX

I have a Cermark F-16. Flies great but its really no speed demon. I have a OS91FX on it with stock pipe and I'm wondering if anybody has any experience getting this combo going faster. A 13x6 is fine for the initial flights but I'm thinking a 12x8 might do it. However, I'm sure someone here has made that engine go very fast, so I'm asking, what prop?
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Old 08-10-2007, 12:15 AM
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Default RE: What Prop for S91FX

ASP has props in 11x11, 11x12, 11x13 and 11x14. Don't know the plane but if the engine has more than enough pull just lacked top speed you may experiment with those props. Cheap speed without investing in a racing engine and a pipe.

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Old 08-10-2007, 11:59 AM
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Default RE: What Prop for S91FX


ORIGINAL: Dig it

I have a Cermark F-16. Flies great but its really no speed demon. I have a OS91FX on it with stock pipe and I'm wondering if anybody has any experience getting this combo going faster. A 13x6 is fine for the initial flights but I'm thinking a 12x8 might do it. However, I'm sure someone here has made that engine go very fast, so I'm asking, what prop?
Use a 12x6 or 12x7 ..... get the rpm up on the engine a bit. Remember, it is an over-grown .61 engine.... let it turn a bit.

The OS91FX with the jett-stream muffler added has shown excellent results in the F-16 and other aircraft -- usually a 12x8 works very well ---- somewhere around 13,000 rpm is typical.
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