HOW HOT SHOULD AN OUTRUNNDER GET? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-25-2007, 04:45 PM   #1
David McMillan
I am: David M
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Location: Mississaug, Ont.

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I installed an outrunner emax 2205 on my Flatout CAP.
I'm using A 30A ESC and installed the supplied 10" prop.
I have an 800MAH 3s 15-20c lipo

I was holding the plane to see if I could get vertical performance
and after a minute of "hovering" I started to hear a noise from the motor.

I used Hot glue to assemble much of the aircraft as it really bonds to the foam well. As such I used the hot glue to hold the firewall to the foam.

The motor was so hot it sizzled when I touched it.
the heat had started to losen the glue in the firewall and the motor was out of allignment. I'm planning to fix all that with some epoxy, but I have serious concerns about the motor. The esc was quite warm as well but not that bad.

I went to a 6" prop and got better rpm out of the motor, but it still got quite warm after about 30 seconds of tested "hover"

Do i need a bigger motor, or just a better motor mount. I'll fabricate something that slips over the central carbon boom and maybe use some epoxy...

Am I asking too much of this little motor?

what dows 2205 mean anyway? I see lots of 4 digit numbers on little motors...
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Old 11-25-2007, 07:08 PM   #2
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Hi David,

I assume this is the motor you purchased from me?

There is two problems with your current setup. First off, the 2205 is only rated to 2 cells, not 3 cells, so you're already pushing the motor beyond it's rated specification in terms of voltage which is resulting in higher than normal amperage draw.

Secondly, the 10" prop is likely too much and is the main cause of your overheating, the motor is designed to work around 8 inch props on 2 cell lipos. Note that it may run fine with a 10" prop at 2 cells, but most likely not on 3.

If the 30A controller is getting noticeably warm to the touch, it means you're pulling a good chunk of amperage from the motor, more than it should be supplying. The motor is only rated to 10 amps peak.

Now, that said, it's normal for a motor to get fairly hot under full power use, especially in a static test condition as you are doing here with your tests. I would advise you not to test too much using this method as this is very hard on the motor. Current and motor temps will always be lower in real flight where there is less load and free flowing air to cool the motor.

Anyways, around ~100 degrees F (~37 to 40C) is the OK zone for motors. You should be able to touch the motor for 2 seconds or so without burning your finger.
True Northern Hobbies, Inc.
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Old 11-25-2007, 09:23 PM   #3
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Originally Posted by David McMillan
what does 2205 mean anyway? I see lots of 4 digit numbers on little motors...
The stator is 22mm in diameter and 5mm high. A lot of manufacturers use numbers like this. If it has a 3rd number, it indicates the number of winds on each stator tooth (or sometimes the total number of winds per phase .... or sometimes the total numbers of winds : )

Some makers use the outside dimensions of the motor. And I swear a few of them just pull numbers out of <you know where> Maybe they are the dimensions of their ideal woman

You have to do your homework on this subject to find out whose numbers mean what (if anything )

Mine is not to reason why; I just wire them up to fry...I mean Fly!
I don't suffer from insanity...I enjoy every minute of it!!!
I never claimed to be the sharpest knife in the chandelier......

Brad Kacer
MAAC # 29287
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