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

Sport Jett .50 prop

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Old 01-03-2008, 07:27 AM
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Zman39
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Default Sport Jett .50 prop

Hey all,

I have scratch built pylon type plane, but a bit smaller than Q500 size . the plane has a laminar wing and really is just a test bed for a speed plane. I am putting a sport jett.50 on it and all up weight is 3.1 pounds. I am going for all out speed and was hoping someone could tell me what prop size will probably give me best results.

Thanks

Z
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Old 01-03-2008, 07:49 AM
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daven
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Default RE: Sport Jett .50 prop

APC 10x7 for test flight, APC 9x8 for speed.
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Old 01-03-2008, 10:54 AM
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Mike Connor
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Default RE: Sport Jett .50 prop

A 9x8 or even a 9x9 works well on that engine. How about a picture?
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Old 01-03-2008, 11:05 AM
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Zman39
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Default RE: Sport Jett .50 prop

Thanks guys, will give those props a try. Putting finishing touches on it today and then will take a pic and post here.............preflight of course


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Old 01-03-2008, 11:11 AM
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Default RE: Sport Jett .50 prop


ORIGINAL: Zman39

Thanks guys, will give those props a try. Putting finishing touches on it today and then will take a pic and post here.............preflight of course


Z
Also take a look at the pylon props recommended by Bob27s in numerous threads. You may find that clipping some pylon props in the 9 inch or more pitch range, down to 8.00 - 8.25" diameter, may work dandy. I'd mess with 8.75 - 9.25 inch pitch as starters. Trim until your ground rpm is within spec, then fly. With a small, clean airframe you may not need the disc area of a 9" prop, and may be able to take advantage of a smaller prop with more pitch.

Which muffler are you using, the sport or SS? The SS will allow you to spin up a bit more and may be the ticket for you.

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