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Old Oct 02, 2005, 02:56 PM
aerobuddy
Joined Dec 2004
85 Posts
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, 03:10 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,634 Posts
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.
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Old Oct 02, 2005, 03:18 PM
aerobuddy
Joined Dec 2004
85 Posts
but i don't know average pitch value for Wemotec midi fan 90mm. Can you please tell me that if you know?
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Old Oct 02, 2005, 03:40 PM
EDF rules... :)
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Joined Nov 1999
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The root pitch is 53*, the tip pitch is 30*.
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Last edited by AirX; Oct 02, 2005 at 03:44 PM. Reason: Edit picture and wording
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Old Oct 02, 2005, 03:41 PM
aerobuddy
Joined Dec 2004
85 Posts
thank you so much Eric
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Old Oct 03, 2005, 12:15 AM
aerobuddy
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can someone provide me thrust vs RPM plot for this fan??
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Old Oct 03, 2005, 04:39 PM
Watts your motivation
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San Bernardino, CA
Joined Aug 2003
6,512 Posts
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
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Old Oct 03, 2005, 06:19 PM
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St. Mary, Maryland, United States
Joined Dec 1996
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www.wemotec.com you can also look through the old EDF columns for some RPM measurements and watt input figures.
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Old Oct 03, 2005, 07:17 PM
EDF Head
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Stavanger, Norway
Joined Feb 2000
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Very comprehensive listing:
http://www.kontronik.com/dowload.htm#midi
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Old Oct 04, 2005, 03:26 AM
aerobuddy
Joined Dec 2004
85 Posts
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
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Old Oct 04, 2005, 03:58 AM
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Wareham, Dorset, UK
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Yes

Klaus
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