[RC-Monster Mike]

Minimal/no brakes on air-based ESCs, and they are also not likely to have a good startup in a land based vehicle. A heli also tends to have high average current, but lower peaks than a car, which can have huge current spikes for very short periods of time(big heli's in 3d flight are quite demanding, though) - not certain how that plays into the design/components. I have had good luck with boat ESCs years ago - the startup wasn't great and mechanical brakes were needed, but it worked quite well.