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New motor but no pull

Old 03-07-2010, 06:20 AM
  #1  
Radbuster
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Angry New motor but no pull

I've had great luck with the 2212-06 motors on foam jets (6x4 prop; 3S lipo). But a new one from rctimer, purchased with a rctimer 30A ESC from A1Hobbies, only draws 10A at WOT. It barely gets my 15oz plane in the air. My other motors draw over 20A and get up and go.

Question: where do I start to figure this out? I can swap components; could it be the ESC; could it be the RX (also brand new-Corona RP4S1); or did I just get a bad motor? Any help would be appreciated.

--- Radbuster
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Old 03-07-2010, 07:25 AM
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Larry3215
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There are lots of possibilities.

1)Is the prop on backwards? That can make a big difference
2)What is the kV of this new motor? It may be a lower kV version. Do you have a tach? If so, you can check the kV and see if it matches what its supposed to be.
3)The prop could be slipping or ther prop adaptor could be slipping.
4)The motor bell could be slipping on the motor shaft - set screw loose etc.
5)Are the settings on this esc the same as on the other one? Same timing?
6)Those Corona rx's dont have a great rep but I doubt thats the problem.
7)You sure the battery was fully charged?
8)Check the LVC setting on the controller and be sure its not set too hi.

Thats all I can think of off the top of my head. Mabe some one else can think of a few more

Check those and let us know.
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Old 03-07-2010, 12:49 PM
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birdDog
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Dang Larry, You're good!
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Old 03-07-2010, 01:01 PM
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#4 on Larry's list bit me. thought I had a bad esc. after that I started taking all the china motors apart and checking them out before even being mounted. found a couple bearings that were forced in hard at a angle, really loose windings, horribly out of balance bells, ect.

I have a ebay(?) website pic of a 2212-06 with a motor plate mounting screw that has been sucked up inside the motor, stuck to the magnets. . I think it was on the RCTIMER store.
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Old 03-07-2010, 05:23 PM
  #5  
Dr Kiwi
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If it used in pusher mode, is the bell rubbing on the mount frame... check that there is sufficient clearance [I mention this because I was testing a KEDA motor and found I had to add a washer behind the stator to get clearance].
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Old 03-07-2010, 07:42 PM
  #6  
Radbuster
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Talking Problem solved

Larry's tip #5 was the key. Although I did have problems earlier with a slipping prop, that was fixed. (BTW, the prop IS mounted backwards on pushers).

Anyway it wasn't the timing, but while I was checking the timing setting (low), I noticed that rctimer wants you to set the throttle throw range; max and none. Mmmm, sounds like my problem. I followed their procedure and voila. WOT is full power.

Lesson: when all else fails, read the directions.

Thank you Wattflyers for the replies.
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