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It is often difficult to know if the esc or motor is at fault. The motor has a very low resistance and it can be difficult to know if it is short or not. With a 450 size motor and 4 NiMh AA cells it is easy. The motor will take 20amps and the NiMhs will give about 10. If you put the NiMhs in a battery holder and put some 3.5mm sockets on the end you'll have a handy test kit, that you can use to set up the heli as well with a servo plug. Just plug one end of the battery to any plug on the motor and you may or may not get a kick out of the motor when you touch the other end on a different plug, then try touching the third plug and you should get a kick as the motor should be in the right position. You can move back and forth and get fairly reliable kicks. This proves that the three paths through the motor are ok and not shorted or open circuit.
For smaller motors use smaller or older batteries. The test works with just one battery when the motor is out of the heli. It should be ok to connect the motor to the esc with little danger of it blowing up the esc. The kicks should be the same in each direction.
If you have a meter you can check for very low resistance between any two leads and also very high resistance between the leads and the motor or heli frame if it is bolted in. For anyone who is new to motors, the screws are often long enough to damage the wiring, so check this.
For smaller motors use smaller or older batteries. The test works with just one battery when the motor is out of the heli. It should be ok to connect the motor to the esc with little danger of it blowing up the esc. The kicks should be the same in each direction.
If you have a meter you can check for very low resistance between any two leads and also very high resistance between the leads and the motor or heli frame if it is bolted in. For anyone who is new to motors, the screws are often long enough to damage the wiring, so check this.
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