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by Ken


I have a Bixler2 with a Hobbyking 2725 1600kv motor Max current 17A, Max power 190W swinging a 7x5 sports prop. I use a Haiyin 2200mAh lipo battery 20-30C 3s connected to a hobbyking red brick 30A ubec 5v/2A and use 4x 9g servos. Initially I connected everything up with 6 servos (including flaps) and the motor lost power and the ESC got very hot. I tried today without the flap servos connected to the receiver but the esc is still getting far too hot. I want to keep it hidden inside my fuselage for neatness. Do I need to create a separate circuit for the servos? Would this solve the problem? If so could somebody please explain to me how to do that.

Thanks in advance, Ken


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ESCes need to breathe
by: rcdude07

ESCes are designed to work with a certain amount of wind/air flowing over them to help dissipate the heat that is created. In order to hide the ESC inside a plane you need to have an air entry hole in the front of the plane, path through the plane for the air to flow, and an exit hole(s). Typically these holes are on the bottom of the plane near the nose/behind the cowl and then on the bottom of the fuse aft the wing.

ESC heating
by: Simon Chaddocks

It is worth remembering that an ESC produces nearly as much heat as a motor and in most cases is completely surrounded by thick shrink wrap where as the motor has rotating parts which stir the air about greatly increasing the rate of heat transfer.
In addition the electronic components in an ESC will fail almost instantly if their temperature limit is exceeded. A motor on the other hand can survive short periods of considerable temperature over load.
The cooling of an ESC needs just as much attention as the motor.

Thank you!
by: Anonymous

Thank you for taking the time to answer my question, it's much appreciated. All the best. Ken

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