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 Brand Selection

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Old 08-23-2004, 10:55 PM
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Barry_DVRC
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Default Prop Brand Selection

Hi guys,
I see lots here on prop size but not much on brand.
I purchased some name brand props but when they arrived the "instructions" claim that tip speed should not exceed 475mph.

So if you do the math



_ MPH x 1056 _
2 x Pi x (Prop Diameter / 2)


For a 10.5" prop and 475MPH you get 15,206 RPM

I suspect many of you could cause one of these to throw a blade.

So what are you using in high RPM applications?


Thanks

Barry
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Old 08-23-2004, 11:03 PM
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Razor-RCU
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Default RE: Prop Brand Selection

APC is the way to go for most sport applications, they also make pylon props, then composite props. are in order---
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Old 08-24-2004, 01:55 AM
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Default RE: Prop Brand Selection

....but, but....I thought.....[sm=stupid.gif]....

Dave.
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Old 08-24-2004, 08:48 AM
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Default RE: Prop Brand Selection

It's OK Flyboy....take a deep breath.....now try again.
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Old 08-24-2004, 09:37 AM
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Default RE: Prop Brand Selection

Barry,

As Razor noted,

APC makes props that are suitable for higher RPM's. There are other manufacturers of composite and continuous fiber props that will safely operate in the higher RPM ranges. Prop choice and resulting RPM all depend on the application.

Most good wood props will run well at higher RPM's as well, although their airfoils tend to provide lower performance than the APCs of similar size at the same RPM. Rev-up, D&W, Zinger pylon series props are all very good (zingers are the only ones still available).

Examples.....

The standard APC C series 10x6 is good for continuous use well over 18K rpm.

The 9" type D series pylon props are suitable for well over 21K rpm.

The APC QM40 props are designed to run well over 26K rpm.

Let us know the engine and aircraft, and we can help suggest a few prop choices for the application.

Bob
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Old 08-24-2004, 11:17 AM
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Default RE: Prop Brand Selection

OK Dave- that 10x7 MA worked perfect on my WHiplash, but it was a full-moon
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Old 08-28-2004, 02:04 AM
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Default RE: Prop Brand Selection

ORIGINAL: Razor-RCU

OK Dave- that 10x7 MA worked perfect on my WHiplash, but it was a full-moon
Yo, James....

....I have modified my prop recommendations for this Millinium....

new [sm=thumbup.gif]....wood, or plastic.
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Old 08-29-2004, 10:39 PM
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Default RE: Prop Brand Selection

Thanks guys,
Prop info is very helpfull. In days of old I'd have gone for Taipan but they don't seem to be around any more. As for the model in question, I'm looking to build either a 363 or 362 Delta. Both very fun models from plans that have been around forever. I've engines and pipes for both, Webra Speed 40 and Speed 28. Have yet to decide which to build first. The plans should arrive this week. I'm tending towards the smaller 362 first with fixed gear and then a 363 with retracts. I hope these combinations will get me into the brotherhood. 8-)

All the best

Barry
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