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Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

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Old 03-11-2011, 04:09 AM   #1
maccountrypilot
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Default Determine EDF?

OK .. I am still confused. In the world of electric prop planes ... a motor should be roughly 100 watts in size for each pound of weight of the plane it is going in. There certainly must be a rule of thumb for EDF aircraft. I do all my own design and it would be nice to know what the general rule of thumb would be. Can Anyone please help??
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Old 03-11-2011, 10:59 AM   #2
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Originally Posted by maccountrypilot View Post
OK .. I am still confused. In the world of electric prop planes ... a motor should be roughly 100 watts in size for each pound of weight of the plane it is going in. There certainly must be a rule of thumb for EDF aircraft. I do all my own design and it would be nice to know what the general rule of thumb would be. Can Anyone please help??
Because EDF are low on Thrust and Power, use the biggest Dia. EDF that will fit into your Plane/Jet use a EDF Motor thats about 3500KV to 4000KV any higher KV on the motor will just be turned to Heat and more AMP draw, Just My 2 cents worth Take care and Have fun, Chellie

the above info does not apply to mini 30mm edfs, there you will need lots of KV to get them going

http://www.rc-electric-jets.com/Elec...uidelines.html

give these people a call, they can answer all of your questions, they are the EDF pros
http://www.rc-electric-jets.com/

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 03-12-2011, 01:57 AM   #3
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On my F-16 (unknown brand) it has a 64mm fan and pulled about 240-250 watts, and weighs just under 18oz, it flies pretty nice, but I don't know how fast, or how it compares to other EDFs like the Habu and many others.

Dave R, Proud PGR rider.
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You become a master at repair.
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Old 03-12-2011, 01:48 PM   #4
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In addition I may add that unlike propeller driven system, EDF do suffer from diminishing return when you try to increase power. It depends on the volumetricity of the EDF. Small EDF like the 55mm and smaller diameter have very small volume, When you try to increase the setup power from 250watts to 400 watts you don't see very significant improvement in terms of vertical climb or speed. That is because as you try to increase the rpm up , there is so much the air can exit the EDF(being small) than the amount the air in getting into the chamber. As a result pressure built up quickly in the chamber and work against the rotating blade.
Diminishing returns set in (sometimes known as saturated state) because you can put alot of power into the motor but very little useful work is converted to thrust or e-fflux because that is so much the air can exit the outlet. Under this situation pound per watt become meaningless.
Therefore bigger diameter EDF performs better and can handle much more power before saturation state occur.

Cheers and welcome to the "duct side.'
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