



Discussion
What is the Velocity of the pumped air in an EDF?
I am using an EFlite DeltaV 15 EDF on 3S Lipo and it Absorbs 300 Watts from the Lipo. EFlite 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. 



Joined Jun 2012
486 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. 
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