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Old Oct 02, 2005, 03:56 PM
ashvani is offline
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aerobuddy

Torque value for Wemotec Midi Fan 90mm


Hi,
Can someone please tell me the torque values as function of RPM for Wemotec midi fan 90mm?? Also can someone explain how to calculate thrust and torque values for a ducted fan. I know Momentum theory and Blade element theory which are used to calculate propeller thrust and torque.

Thanks
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Old Oct 02, 2005, 04:10 PM
AirX is offline
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EDF rules... :)
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Just calculte it as you would an air mover, figureing the average pitch as driving the calculation for thrust. It is quite different from a propellor driven system as the airfoil in the blades provide such little force in producing thrust. Yes I know there is more to it than that but it will get you started.

Eric B.
Old Oct 02, 2005, 04:18 PM
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but i don't know average pitch value for Wemotec midi fan 90mm. Can you please tell me that if you know?
Old Oct 02, 2005, 04:40 PM
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EDF rules... :)
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The root pitch is 53*, the tip pitch is 30*.
Last edited by AirX; Oct 02, 2005 at 04:44 PM. Reason: Edit picture and wording
Old Oct 02, 2005, 04:41 PM
ashvani is offline
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aerobuddy
thank you so much Eric
Old Oct 03, 2005, 01:15 AM
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can someone provide me thrust vs RPM plot for this fan??
Old Oct 03, 2005, 05:39 PM
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Watts your motivation
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I know there is a graph here somewhere. My search isn't turning it up. I am just getting into larger than 70mm fans at the moment, and didn't have a need to save that information back when I saw it. Good luck!

Justin
Old Oct 03, 2005, 07:19 PM
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www.wemotec.com you can also look through the old EDF columns for some RPM measurements and watt input figures.
Old Oct 03, 2005, 08:17 PM
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Very comprehensive listing:
http://www.kontronik.com/dowload.htm#midi
Old Oct 04, 2005, 04:26 AM
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What is "VStrahl" in the linked excel file for Midi fan on the kontronik website. Is it efflux velocity of air coming out of fan after stators?

thanks
Old Oct 04, 2005, 04:58 AM
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Yes

Klaus


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