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

need Square 11 or 12 in speed prop

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Old 03-03-2008, 08:12 PM
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sparky925
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Default need Square 11 or 12 in speed prop

I need to find a good and efficient 11x11, 12x11, or 12x12 speed prop...
perfer carbon, but what you got for recommendation?

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Old 03-03-2008, 11:24 PM
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Default RE: need Square 11 or 12 in speed prop

For 12x12 you only have two choices really. APC pattern prop or a APC-E prop. The E-prop is more effecient but it is a very light lay up and thus isn't considered durable enough for glow use where the prop gets flipped with sticks etc.
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Old 03-04-2008, 06:59 AM
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Default RE: need Square 11 or 12 in speed prop

thats kind of what i thought.
i was hoping to find a carbon prop...i guess i could lay one up, i just would like to find a
the best airfoil and pconstant combonation first..
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Old 03-04-2008, 07:05 AM
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Default RE: need Square 11 or 12 in speed prop

if you find these props, i know of someone else who is looking also. in fact, there is a thread posted a month ago asking the same question. i think he was directed to look in germany where the real speed planes are.

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Old 03-05-2008, 12:19 PM
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Default RE: need Square 11 or 12 in speed prop


ORIGINAL: sparky925
I need to find a good and efficient 11x11, 12x11, or 12x12 speed prop...
perfer carbon, but what you got for recommendation?
For starters APC has 11x11, 12x10, 12x11, 12x12, and 12x14 sizes. How fast you gonna spin these?

MJD
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Old 03-05-2008, 12:42 PM
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Default RE: need Square 11 or 12 in speed prop

as fast as humanly possible of course!

looking at about 14k
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Old 03-05-2008, 07:11 PM
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Default RE: need Square 11 or 12 in speed prop

A 12" diameter APC prop is safe to 15,833 and 11" to 17,272 RPM. They are VERY efficient. Keep in mind that some over square props tend to stall/slip on the ground and load down the engine in the air once the prop "hooks up".
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Old 03-05-2008, 08:32 PM
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Default RE: need Square 11 or 12 in speed prop

the real fast engines, ops, os .91 vr-df engines, rossi .91 df's need continuous strand carbon fiber props as i understand. 20,000+ rpm's is what i thought you were talking about.

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Old 03-05-2008, 08:41 PM
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Default RE: need Square 11 or 12 in speed prop

the real fast engines, ops, os .91 vr-df engines, rossi .91 df's need continuous strand carbon fiber props as i understand. 20,000+ rpm's is what i thought you were talking about.

david
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Old 03-11-2008, 11:37 AM
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Default RE: need Square 11 or 12 in speed prop

I'd be real interested to know of the .91 out there that can spin a 12x12 at 20,000rpm. I've never heard of such a thing. From my calcs the power to spin a 12x12 prop at 20,000rpm is somewhere around 10-12hp which is more than double of any of those engines on their best day.

ORIGINAL: dhal22

the real fast engines, ops, os .91 vr-df engines, rossi .91 df's need continuous strand carbon fiber props as i understand. 20,000+ rpm's is what i thought you were talking about.

david
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Old 03-11-2008, 08:24 PM
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Default RE: need Square 11 or 12 in speed prop

the os vr-df .91 turns well above that with a ducted fan unit i think. of course a prop is a whole nother story. i thought i saw a rossi .91 df rated at 8-9 hp.

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Old 03-11-2008, 11:00 PM
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Default RE: need Square 11 or 12 in speed prop

They may rate it there, but I doubt it is doing more than 7 hp/c.i.
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Old 03-13-2008, 01:24 PM
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Default RE: need Square 11 or 12 in speed prop

I am turning the O.S. 91 DF engine in my Warbird Races with a 11 X 11 prop at about 16,500 peak. This is on 30% Nitro and 23%oil. I am using the Straight Header adn 15cc Muffled Macs pipe. I usually back off till about 15,800 on the ground as the motor unloads a ton in the air. Speed wise, plane has been clocked at 165MPH on the course.

You have to check the props every flight as I have noticed some props start to stress crack after about 10 flights. This could be due to the high"G's" we are turning also. APC says dont take these props over 18K....

I am working on finding a source for Carbon Props.
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Old 03-14-2008, 01:18 PM
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Default RE: need Square 11 or 12 in speed prop


ORIGINAL: T34RACING

I am turning the O.S. 91 DF engine in my Warbird Races with a 11 X 11 prop at about 16,500 peak. This is on 30% Nitro and 23%oil. I am using the Straight Header adn 15cc Muffled Macs pipe. I usually back off till about 15,800 on the ground as the motor unloads a ton in the air. Speed wise, plane has been clocked at 165MPH on the course.

You have to check the props every flight as I have noticed some props start to stress crack after about 10 flights. This could be due to the high"G's" we are turning also. APC says dont take these props over 18K....

I am working on finding a source for Carbon Props.

Hey T34Racing, is this your engine? http://www.osengines.com/engines/ductedfan.html

I want to give it a try with a 15cc mac pipe.
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Old 03-14-2008, 02:11 PM
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Default RE: need Square 11 or 12 in speed prop

Yeah as you can see math doesn't lie a 12x12 at 20,000rpm takes some serious power.
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