how hot is too hot for esc and motor - RC Groups
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May 22, 2006, 04:31 AM
Registered User

how hot is too hot for esc and motor

Hi all,
I bought this cheapo motor on ebay form xmseller, seemed like a pretty good deal 30 bucks or so labeled as a 3500 kv.
I am running a CC45 with the same settings I had on my corona with a mega 16-15-3 can't quite remember the exact settings ,but using those recommended by the "gurus" on this board so I really do trust them.
I have a jet ranger shell and running an apex 15c 2200 3s lipo.
After a 5 minute hover/ flight I pulled the nose off and measured the ecs at 150 and the motor at 185. This seemed pretty hot to me, ambient was about 77 F. I dont really care if I fry this motor but can this cheapo motor be breaking my esc? When I ran the mega 16-15-3 with the same battery and esc it would get to about 180 with no body on, but I never did measure the ecs temp with the mega. I read the megas get naturally hot so it didn't really bother me. Any other cooler running motors out there? I did check my gear mesh and tail belt tension and both are not too tight.
Oh I am running an align head sink on both, and have cut some cooling holes in the bottom of the Jet ranger.
any input appreciated.
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May 22, 2006, 07:28 AM
That'll hold until ...
swatson144's Avatar
The motor is getting too hot, maybe lower the pinion a tooth or 2 if possible. The 16-15-3 is 3000 kv so you are probably having heat from too tall gearing.

The CC45 is comfortably warm. Cooler is better.

May 22, 2006, 04:33 PM
Registered User
ok, but I'm already running the 11 tooth pinion, where do I get a smaller pinion, or any other cooler motors out there?
May 22, 2006, 05:21 PM
Registered User
zx1100's Avatar
I just ran my ARK with an APEX 2200, CC35, and an AON motor last night and the motor temp was around 120 +/- depending on where I point the temp gun. The battery was mid 90s and if I remember correctly my ESC was was around that temp also. I was mainly hovering trying to adjust everything after rebuilding the head.
May 22, 2006, 05:48 PM
That tree again!!!!
thanhTran's Avatar
your temp readings on motor and ESC seem too high. The temp on my trex with JGF 450 or align 430L motor is around 110-130 (with 450TH I pointed the temp meter at the coil.) with heavy sport flying.

A bad motor could fry and could kill your ESC.

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