Very HOT Eagle ESC on new Trex 450 - RC Groups
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Jun 15, 2007, 11:05 AM
KJ4IKY Gravity Wins
blade thrasher's Avatar

Very HOT Eagle ESC on new Trex 450

I just got my new 450 XP in today and after getting everything balanced and pitched I fired it up. It has an Eagle 30A speed control running a 3500Kv. After startup on some trials it would make a strange beeping sound then no power was sent to the motor? We could smell the ESC while standing over it. All this was not even half throttle while sitting in the grass.

Trex 450
Futaba S9650 Tail
3500kv Outrunner
Eagle 30A ESC
2200mAH 20C
Logitec 2100T HH
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Jun 15, 2007, 12:34 PM
KJ4IKY Gravity Wins
blade thrasher's Avatar

Getting hot with just servos connected

I was working on gettng the right swash mix with the DX7 and with the motor unplugged the ESC got hot enough to smell? Is this normal? Im assuming its one or all of the servos dissapating heat in the ESC for some reason?
Jun 15, 2007, 12:38 PM
Are you running a separate BEC?
Jun 15, 2007, 12:43 PM
Registered User
Sounds like your electronics are too much for the internal bec to handle.Time for an external one and I personally think it's a good idea anyway no matter what brand of esc.
Jun 15, 2007, 12:46 PM
I am running pretty much a similar setup except the GY401 for the gyro and I definately needed and external BEC.I went with the KoolFlights UBEC. Heavy but awesome.
Jun 15, 2007, 01:01 PM
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HeliSmith's Avatar
SportBEC is also nice. You don't have to cut your ESC power wire either. 29.99 with 1.25 shipping from:

I am not afiliateed with them, just when I get a nice product I pass the word.

Jun 15, 2007, 06:24 PM
KJ4IKY Gravity Wins
blade thrasher's Avatar
Thanks for the info, I just got done ordering a sport BEC. Should I stop trying to get a smooth hover untill it comes in? Basically, will I burn up my ESC flying low tuning?
Jun 16, 2007, 09:38 AM
Registered User

SmartBec on the way too!

My esc gave up the ghost last week for some reason. So I have ordered another esc and a SportBec. My question is: what setting should I have on the SportBec; 6V or the other setting. Oh by the way, this is for my Trex SE. Thanks guys!
Last edited by bh95; Jun 16, 2007 at 06:50 PM.
Jun 19, 2007, 07:46 AM
Registered User

SportBec location?

I just received my SportBec yesterday. Where is the best location for it on my Trex SE? On the side of the frame or up next to the ESC? Or somewhere else? Thanks a bunch!
Jun 19, 2007, 08:31 AM
Registered User
Anywhere it fits, but away from the gyro.
Jun 20, 2007, 06:41 PM
KJ4IKY Gravity Wins
blade thrasher's Avatar
I just did a test hover to check the gyro settings. The motor is getting very hot also, 198 degrees after 1 min. ESC was at 171 degrees. Will the BEC solve both high temp problems?

I dont know what brand the motor is? It just says 3500 with some Chinese writing also. The ESC is Eagle 30A. 2200 mAh battery

Last edited by blade thrasher; Jun 20, 2007 at 06:49 PM.
Jun 20, 2007, 08:02 PM
Registered User
The BEC won't help the motor. A smaller pinion will, though, by reducing the headspeed and therefore the power required for hover.
Jun 20, 2007, 09:04 PM
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tommyeflight89's Avatar
Check your amp draw at full picth. It could be geared wrong.
Jun 21, 2007, 04:17 PM
KJ4IKY Gravity Wins
blade thrasher's Avatar

HOT motor 198 Degrees / HOT ESC

Here is a close up of the gear mesh. Does this look to tight? As far as the tail goes it does not look streched or twisted. When it spins down it does not come to an abrupt stop but it will not spin as long as my CP2 with a one way gear by any means.

I'll add some photos in case there is a misalignment that I am overlooking.
Last edited by blade thrasher; Jun 21, 2007 at 04:36 PM.
Jun 21, 2007, 07:06 PM
Registered User
That's a 15T pinion, you just need a smaller one. Try 11T, if there's not enough headspeed use 13.

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