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

Pusher Plane Prop

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Old 05-13-2014, 03:39 AM
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rcdavefly
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Default Pusher Plane Prop

Good Morning ,
I have a pusher plane and have a APC 6x4 prop on it at this time , and would like to speed the plane up a little . I was thinking of replacing this prop with a APC 5x3 to speed up the plane but am not sure about this . Any advice would be appreciated , Thank You
David
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Old 05-13-2014, 06:55 AM
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MJD
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Without knowing what powers the airplane, it is impossible to know what effect the prop change will have. What is the engine?

If you are talking .049/.051 power, then there is about a 9.5/10 chance changing to the 5-3 will speed things up. 6-4 is a very high shaft load for nearly all .049's and clamps down the rpm and power.
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Old 05-13-2014, 10:43 AM
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The Grish company sold a yellow nylon pusher prop of around 5 x 4 size. They are a swap meet or ebay item now. I've cut this one down to about 4.25" for a .049 powered pusher speed plane project. A decent TD should tach about 22-23,000 rpm.
You can also take your 6 x 4 APC and chop it down to experiment a little bit, but APC props work best if you can find the correct size to begin with.
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Old 05-13-2014, 10:47 AM
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It would be good to know what the engine is. With luck it's a reedie and he has a whole catalog of props available.
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Old 05-14-2014, 07:33 AM
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rcdavefly
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Thanks Everyone
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Old 05-14-2014, 07:48 PM
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Don't forget 2 strokes will run hot with excessive shaft load, so when you then put that in a pusher setup you have potential for a temperamental arrangement. So if this is a Cox .049, I'm not a fan of that 6-4 (even in a tractor setup. Let 'em spin, keep 'em cool and happy - 5-3 good prop. I'm not saying it is a disaster waiting to happen, just not a direction I would be comfortable with.

If it is something else.. then what is it rcdf?
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