Are Zippy Lipos safe with a Castle MMM Speedy?

[RC-Monster Mike]

"all but disabled" or actually disabled? The motor itself has mass and can result in significant back emf when applying brakes to slow itself down(Brian and I discussed this yesterday in fact regarding some tests he performed). IIRC, the motor in question produced nearly 30 volts of back emf when the brakes were applied - using a 4s pack to accelerate. No load other than the motor itself.