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Old Sep 13, 2001, 09:54 AM
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Joined Sep 2001
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APC electric props - Strong?

Hi there;

Do the new APC electric props have the
strength to withstand high revolutions?
I was thinking of using them to replace
my regular APC props on my Astro 15 (10
cell) and Astro 05 FAI (7 cell) airplanes
but worry they may lack the strength.

I was going to ask APC but couldn't find
a way to ask them directly from their website.

Craig
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Old Sep 13, 2001, 11:05 AM
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The APC Electric props are made for the type of application you mentioned. Just don't use them on "gas" engines.
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Old Sep 13, 2001, 01:52 PM
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United States, VA, Arlington
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Craig
They'll do fine for the apps you are using. I've run their 12 x 10 E prop on 600 watts plus, for one example.

Don't confuse the regular E props with their Slowfly props though

The slowfly props come in some pretty large sizes, but definitely won't like up around 300 watts

Dereck
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Old Sep 13, 2001, 11:47 PM
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I am using a Speed 400 motor on my "Fundango", wich of the APC props will give me the better performance the "E" series or the "Slow flyer" series ?

Thanks
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Old Sep 14, 2001, 02:32 AM
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United States, CA, Lake Forest
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Quote:
Originally posted by Dereck
Don't confuse the regular E props with their Slowfly props though

The slowfly props come in some pretty large sizes, but definitely won't like up around 300 watts

Dereck
Good Call Dereck
I've spun the APC-E pylon props (4,7-5.5") upwards of 35,000 RPM on roughly 700W of power. No kabooms!! yet.
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Old Sep 17, 2001, 09:22 PM
Ron
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I know of several planes that spin APC electric props 13 X 7 at over 9500 RPM. they stand up well. Havn't seen a failure yet, except when they strike the ground REALLY hard ( read crash )
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Old Sep 18, 2001, 03:04 PM
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Victoria, BC, Canada
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Re: APC electric props - Strong?

Quote:
Originally posted by climber
Do the new APC electric props have the
strength to withstand high revolutions?
Absolutely. They can easily handle high revs. The "gas" props need to be stiffer to handle the explosions of torque that an internal combustion engine creates but electric power is very smooth.
As the revs get higher, balancing the prop becomes even more critical. The thin slow fly props are a little more susceptible to warping and aerodynamic imbalance. Finally, remember that a large diameter prop at high speed might go supersonic at the tips.

Rick.
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