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

Prop selection help please

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Old 04-04-2007, 05:04 AM
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72nova
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Default Prop selection help please

i need your guys help i have a sig kobra with a 32sx with tuned pipe and i am in desprite need to know what is the best size prop
to use to get max mph
thanks
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Old 04-04-2007, 07:38 AM
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Default RE: Prop selection help please

The 32 SX works well on a smaller airframe with an APC 8 x 7.

For your plane - try an APC 9 x 6.

Or a Bolly 9.5 x 6.

Good luck.
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Old 04-04-2007, 11:50 AM
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KC36330
 
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Default RE: Prop selection help please

i used a OS32 (with a heli pipe) on a US40 and achieved max speed with an APC 9x7, took allot of runway to get airborne but top speed was clocked with a hand held at 104mph.

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Old 04-04-2007, 12:33 PM
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Default RE: Prop selection help please


Nice little Kobra

prop selection has everything to do with how you pipe is set up.

What prop are you using now? What rpm? What is the pipe length set at ?

In general (without knowing the above info), the OS 32 likes rpm. I'd tend to work with an 8x7, 8x8, 9x6, and maybe even try the APC 8.5 x 7.25 q-500 prop - all depends on how the plane resonds to it.

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