Brushless Hyper 8

[Arct1k]

2650kv on 6s is a bit high - 2200kv is better for 6s

The 2200kv has a longer rotor (more torque) and hence I think would survive better for sustained high speed.

You could try with a 2650kv - but it will have to be speed run or 2, cool down, speed run, cool down etc etc