



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
470 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. 
Thread Tools  
Similar Threads  
Category  Thread  Thread Starter  Forum  Replies  Last Post 
For Sale  100 psi Robart Air Pump with built in Gauge  CedarTree  Aircraft  General  Miscellaneous (FS/W)  2  May 31, 2015 07:51 PM 
Question  Hypothetical question  what happens if you run an EDF with the duct removed?  LMF5000  Power Systems  9  Apr 18, 2014 04:38 PM 
Discussion  Ducted Fan & Velocity of the air in tailpipe.  Texas Buzzard  Modeling Science  65  Oct 22, 2012 01:54 PM 
what is the airspeed velocity of an unladen swallow?  roguewolf  Parkflyers  36  Oct 25, 2003 01:12 AM  
WHAT is the airspeed velocity of an unladen... SlowStick?  eBird  Parkflyers  55  Aug 18, 2003 03:28 PM 