70mm EDF 3900kv motor - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-21-2021, 09:27 PM   #1
NDW
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70mm EDF 3900kv motor


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Need alittle direction here. I have a Dr. madd thrust 70mm unit with a 3900kv motor turning a 12 blade fan made to run on 4 cell lipo. Great running unit unit I stuffed a 5 cell lipo in it and in the first few minutes let the magic smoke out.
Hereís my question. I canít seem to find a replacement motor anywhere. Doesnít have to be the same make just a motor that fits the bill. Any one that can point me in the right direction I would greatly appreciate
Dave.
This is the dead one
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Old 02-22-2021, 07:08 AM   #2
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Re: 70mm EDF 3900kv motor

Best to buy a wattmeter first. I imagine 3900kv would be a hot setup on 4S.
If you want or need to run a higher cell count look for lower kv motor.
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Old 02-22-2021, 11:24 PM   #3
NDW
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Re: 70mm EDF 3900kv motor

Thanks for your reply. This unit on a 4 cell HV battery really motivated my star max F86. Grabbed a 5 cell and smoked the motor by accident. But did have a great puff of smoke as it died on a low pass. I just want a replacement motor of some kind to put the unit back together. So much out there I don’t know what to buy. Looking for suggestions and recommendations
D.
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Old 02-23-2021, 01:49 AM   #4
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Re: 70mm EDF 3900kv motor

Check out Aliexpress or Banggood. Search 70mm EDF 4S.
Lots of choices for parts and complete units cheap.
https://www.aliexpress.com/wholesale...xt=70mm+4S+EDF

https://www.banggood.com/search/70mm....html?from=nav

If you prefer a 5S unit, I might have one that should work. It has run 6S but I think 5S would be perfect.
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Old 02-23-2021, 10:00 PM   #5
NDW
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Re: 70mm EDF 3900kv motor

Thanks for the links. Exactly what I was looking for...
much appreciated
D
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