how many volts will the 21.5T handle?

[BrianG]

There are two factors that determine how much voltage a motor can take.

1) Electrically, the dialectric strength of the coil wire insulation, which is usually some type of varnish substance. As long as the voltage isn't high enough to "jump through" the insulation, which usually takes into the hundreds of volts, the coil is fine. However, a voltage that is too high can cause overheating, which could melt this insulation shorting the coils. This would appear to be caused by overvoltage, but only indirectly as the real culprit is the current.

2) Mechanically, the rpm limit. As long as the kv * v doesn't exceed the max rpm limit of the motor, it's fine.

[Semi Pro]

Originally Posted by BrianG

There are two factors that determine how much voltage a motor can take.

1) Electrically, the dialectric strength of the coil wire insulation, which is usually some type of varnish substance. As long as the voltage isn't high enough to "jump through" the insulation, which usually takes into the hundreds of volts, the coil is fine. However, a voltage that is too high can cause overheating, which could melt this insulation shorting the coils. This would appear to be caused by overvoltage, but only indirectly as the real culprit is the current.

2) Mechanically, the rpm limit. As long as the kv * v doesn't exceed the max rpm limit of the motor, it's fine.

so based on your statements as long as the motor does not overheat it will be fine.