Oct 11, 2012, 06:39 PM Texas Buzzard McAllen,Texas Joined Mar 2004 1,034 Posts Discussion 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 Registered User Joined Jun 2012 419 Posts 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.
 Oct 11, 2012, 10:05 PM Low rates are for wimps United States, CO, Colorado Springs Joined May 2008 3,253 Posts Latest blog entry: Hobby TopGun MiG-15 with Aluminum Finish

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