How hot should the motor be?

RCheliski · 07-10-2012, 01:58 AM

Hi folks!
I am running a stock T-Rex 600EFL Pro (Align 600MX, Castle ICE HV 80 Brushless ESC) Align 40C's or G-Force 40C's. After about 5 or 6 minutes of hovering, the motor is very hot (Cannot hold my finger to the top) and the ESC is very warm, almost hot. How hot should these get?

Thanks!
Ed

pril250 · 07-10-2012, 09:31 AM

Check for tight mesh pinion to main gear and tail belt or TT drive gears. Some times you can feel if things are too tight by rotating the blades with one finger and see if the mechanics continue to rotate reasonably with the inertia. Any binding on the drives could cause the motor excess resistance=heat. You could also look at the CC graphes to analyse the ESC temp rise and the power the motor is dissipating.

RCheliski · 07-10-2012, 11:29 AM

Quote:

Originally Posted by pril250

Check for tight mesh pinion to main gear and tail belt or TT drive gears. Some times you can feel if things are too tight by rotating the blades with one finger and see if the mechanics continue to rotate reasonably with the inertia. Any binding on the drives could cause the motor excess resistance=heat. You could also look at the CC graphes to analyse the ESC temp rise and the power the motor is dissipating.

Thanks. The gears are not binding and are at a good tension. Not too tight. Not too loose. Plus with the way this TRex is build, there really isnt any way to adjust any tension. At least I dont think there is.

Stevendavis · 07-10-2012, 12:17 PM

I've been checking mine and it gets to 150* F at the bearings, and 120* to 130* along the can.

utrinque · 07-10-2012, 05:07 PM

Possible reasons:

- hot weather
- to much friction in some place (described already in previous posts)
- to high cyclic angles (not a case while you only hover)
- lack of free airflow and cooling

Nitro engine will not be damaged if load is to high it will slow down and eventually stop.
No load can damage nitro engine because o high revs can make it explode in extreme case.

Oposite story in electric setup.
Without load electric motor will rotate close to KV never fasterand draw low current.
It can be damaged by to high load or to high voltage. Both make electric engine get hot end eventually burn.

I supose Scorpion motor can survive 100 degr Centigrade. If you can not touch this it is to hot.
Hope this helps.

07-10-2012, 01:58 AM	#1
RCheliski Registered Users Join Date: Sep 2006 Location: Not in Oahu, Hawaii any more :(	How hot should the motor be? Hi folks! I am running a stock T-Rex 600EFL Pro (Align 600MX, Castle ICE HV 80 Brushless ESC) Align 40C's or G-Force 40C's. After about 5 or 6 minutes of hovering, the motor is very hot (Cannot hold my finger to the top) and the ESC is very warm, almost hot. How hot should these get? Thanks! Ed

07-10-2012, 09:31 AM	#2
pril250 Registered Users Join Date: Aug 2008 Location: London, Uk	Check for tight mesh pinion to main gear and tail belt or TT drive gears. Some times you can feel if things are too tight by rotating the blades with one finger and see if the mechanics continue to rotate reasonably with the inertia. Any binding on the drives could cause the motor excess resistance=heat. You could also look at the CC graphes to analyse the ESC temp rise and the power the motor is dissipating. __________________ T-Rex600-ICE100,WR10ABEC,Scorp4025-1100+17T,Kasama head,QUK Swash CNC Tail,G-Force blocks,3152,DS760+BLS251,DX7+AR7000,FM. Blade400-CC ICE50,Scorp2221-8+12T,Sonix Head&Tail,5A BEC,HS65HB,Quark+3500G,AR7000,Align Carbon blades,TRex500 Skids,Flymentor.

07-10-2012, 05:07 PM	#5
utrinque Registered Users Join Date: Feb 2011 Location: Warsaw, Poland	my 5c Possible reasons: - hot weather - to much friction in some place (described already in previous posts) - to high cyclic angles (not a case while you only hover) - lack of free airflow and cooling Nitro engine will not be damaged if load is to high it will slow down and eventually stop. No load can damage nitro engine because o high revs can make it explode in extreme case. Oposite story in electric setup. Without load electric motor will rotate close to KV never fasterand draw low current. It can be damaged by to high load or to high voltage. Both make electric engine get hot end eventually burn. I supose Scorpion motor can survive 100 degr Centigrade. If you can not touch this it is to hot. Hope this helps.

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07-10-2012, 12:17 PM	#4
Stevendavis Registered Users Join Date: Oct 2009 Location: Ashton, ID	I've been checking mine and it gets to 150* F at the bearings, and 120* to 130* along the can.