motor for hyper sc10

[BrianG]

That's not even 20k rpm on 3s. If you gear high enough to have decent speed, you might get cogging on startup as the ESC tries to find rotor position. A sensored system would tolerate this better. I would get a motor with a kv of ~3000 (for 3s) or 4500 (for 2s). Low kv isn't always best - it's about matching the kv with the voltage.