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heat from a outrunner

Old 06-20-2009, 05:41 AM
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Rhondas
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Default heat from a outrunner

how hot to the touch should the average brushless motor of speed 400 size with a 8X5 prop be after a 10 minute flight with a 3 cell lipo pack ?
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Old 06-20-2009, 05:52 AM
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Gnascher
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Warm, but not uncomfortably hot.
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Old 06-20-2009, 08:14 AM
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CHELLIE
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Originally Posted by Rhondas View Post
how hot to the touch should the average brushless motor of speed 400 size with a 8X5 prop be after a 10 minute flight with a 3 cell lipo pack ?
Whats the kv on that motor, and does your motor have good air flow around the motor, if not, open up some vent holes to let some air get to the motor, also, check to see if air can get out of the rear of the plane for good cooling of the electronics, Take care, Chellie
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Old 06-20-2009, 12:48 PM
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Sky Sharkster
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Default Some Like It Hot?

Hi Rhondas,
Gnasher and Chellie are right, generally warm but not too hot to hold in your hand. But a lot depends on whether it's cowled in and how the air venting is working. Outside temperature makes a difference, too.
One way to check before you fly is a Whattmeter. If the amp draw with a particular prop/battery combination is within the specs for the motor, you should be OK. Over-propping (or too many volts for the prop size) may be the single biggest error going. An overly hot motor will be one of the signs, and the final indicator is...smoke. By then, it's too late!
Ron
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Old 06-21-2009, 05:24 AM
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Larry3215
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For most people around 140 degrees F is the start of "too hot to touch".

Thats actually a safe temp for most motors. Some of the top quality motors out there have magnets that are safe up to well over 200 degrees C which is 392 deg F and can run that hot all day long with no damage.

The cheep outrunners and inrunners are made with much lower quality parts and the magnets start to deteriorate at 150 deg F or even less.

So if its a cheep motor keep it cool enough to hold your fingers on it for several seconds without being uncomfortably hot. It can still be quite warm, but if you think you need to say ouch, then its too much.

A hi quality motor can run hot enough to blister you with no damage - to the motor at least
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Old 06-21-2009, 05:31 AM
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Rhondas
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Default motor hot to touch

Originally Posted by Larry3215 View Post
For most people around 140 degrees F is the start of "too hot to touch".

Thats actually a safe temp for most motors. Some of the top quality motors out there have magnets that are safe up to well over 200 degrees C which is 392 deg F and can run that hot all day long with no damage.

The cheep outrunners and inrunners are made with much lower quality parts and the magnets start to deteriorate at 150 deg F or even less.

So if its a cheep motor keep it cool enough to hold your fingers on it for several seconds without being uncomfortably hot. It can still be quite warm, but if you think you need to say ouch, then its too much.

A hi quality motor can run hot enough to blister you with no damage - to the motor at least
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thanks every one
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