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

24000 RPM! Do you believe it?

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Old 04-03-2009, 10:38 AM
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Kmot
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Default 24000 RPM! Do you believe it?

In any case, this guy is playing Russian Roulette by hanging over the prop spinning up like that:

http://www.youtube.com/watch?v=KsjRFE04ryU
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Old 04-03-2009, 11:37 AM
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vicman
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Default RE: 24000 RPM! Do you believe it?

Wood prop and all.
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Old 04-03-2009, 12:35 PM
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Default RE: 24000 RPM! Do you believe it?

Not really the sharpest tool in the shed.
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Old 04-03-2009, 12:44 PM
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Default RE: 24000 RPM! Do you believe it?

Hey!

I know you!
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Old 04-03-2009, 03:19 PM
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Default RE: 24000 RPM! Do you believe it?

....nowhere near 24,000 to my ear.

FBD.
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Old 04-03-2009, 03:57 PM
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daven
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Default RE: 24000 RPM! Do you believe it?

I don't doubt the 24k, plus, just because it is a wood prop, does not mean it is unsafe.

We have run wood props at and above 24k for years.
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Old 04-04-2009, 08:05 AM
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MJD
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Default RE: 24000 RPM! Do you believe it?

It sounds a few cents higher than Eb = around 18k.

Liar liar pants on fire! Either that, or better get a new tach.
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Old 04-04-2009, 08:23 AM
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Default RE: 24000 RPM! Do you believe it?

The prop looks like an old Top Flite pylon prop. Maybe not the best wood prop ever made. With any wood prop you need to test and carefully inspect the blades and hub.

One test that they must be able to pass is to hold one blade and flex the other at least a 1/4 to 3/8" forward and back. If the grain has any swirls that the blades were cut through the bad grained props will break in your hands and not be thrown from a running engine.

The other area is to examine the hub area for checks in the wood from machining. This was more common on some brands and rare on others due to the type of knifes used in the shaper. A check is where the grain was lifted.

The nice thing about wood props is that you can easily modify them to get the rpm and pitch curve needed. Fuel proofing can be done with CA and a paper towel to wipe it on. When checking the pitch, if different between the two blades, it is often that the hub is slightly tapered which can be brough back to even pitch by scraping the backside of the hub with a razer blade.
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Old 04-04-2009, 10:19 AM
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Default RE: 24000 RPM! Do you believe it?

I don't care what kind of prop it is. I do not put my body parts in the arc of any prop much above idle.
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Old 04-05-2009, 09:49 AM
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daven
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Default RE: 24000 RPM! Do you believe it?

I like to soak my wood props in a tube of thin CA, about 10 seconds for each half, then a quick wipe off with a paper towel.

Light sand / balance with 400 grit, and then polish with Mothers.

You would be surprised how many racers set needles just like he did, on the line, at 24k +
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