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Oct 11, 2012, 06:39 PM
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McAllen,Texas
Joined Mar 2004
1,031 Posts
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What is the Velocity of the pumped air in an EDF?
I am using an E-Flite DeltaV 15 EDF on 3S Lipo and it Absorbs 300 Watts from the Lipo. E-Flite says the velocity of the air in the tailpipe is 71 mph.
Is there a mathematical method of calculating the exhaust velocity from knowing the Watts and the density of air? Is another factor needed? The density of air is 1.29 gms per liter. |
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Oct 11, 2012, 09:50 PM
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Joined Jun 2012
318 Posts
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There is no formula for this, only tools to measure it. and your exhaust velocity ( efflux ) is changed by your exhaust tube exit diameter.
For more info on this look at the last couple of pages of the Change sun 10blade 70mm fan. There is a bunch of engineers talking about that right now. |
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Oct 11, 2012, 10:05 PM
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Canada, AB, Edmonton
Joined May 2008
2,793 Posts
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Check out some of these threads:
http://www.rcgroups.com/forums/showthread.php?t=1742680 http://www.rcgroups.com/forums/showthread.php?t=1714461 http://www.rcgroups.com/forums/showthread.php?t=1678541 http://www.rcgroups.com/forums/showthread.php?t=1671987 http://www.rcgroups.com/forums/showthread.php?t=1474158 |
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Latest blog entry: Dynam Me-262 Schwalbe in Flight
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