Joe,

Lots of people have put brushless motors, both main and tail, on an Axe.

Check this site and others. All the info. you want is available.

My opinion: Putting any more money in an Axe than absolutely necessary
to keep it flying is a mistake. Save your money because you will want to
buy a bigger and better helicopter.

If you've toasted the 3 in 1 board, then going brushless may be cost
effective. You must buy an electronic speed control for a brushless
motor and the main motor.

Opinions vary about using a brushless motor for the tail. I've read some
comments that a brushless tail motor does not respond fast enough.

If the 3 in 1 is dead, and you don't want to replace it
then you have to buy the appropriate ESC for the tail
motor as well.

And you have to buy a gyro to use in lieu of the one on the 3 in 1 board.

To recap: Say the 3 in 1 is good, but you want a brushless main motor, then
you'll need the brushless esc and motor. You can still use the 3 in 1 for the
gyro and the brushed tail motor esc.

If the 3 in 1 is bad and you don't want to replace it, then you will also
need an esc for the tail motor and a gyro.

You can also stay with brushed motors, main and tail, and buy esc's for them.

www.hobbyking.com has a cheap brushed motor esc and cheap brushless motors
and esc's and gyros. The C12 brushed esc is more expensive, but I've got
it on one of my Axe's for the tail motor and it works well, check Tower Hobbies.

Good luck.