Avenger has a 300W scooter motor on 22.2V, a 80:11 reduction and a 300mm axe and it manages to get a bit of air while self righting. A quick guesstimation while looking at the motor power graph (chinese, so don't trust it) and guessing the rpm, I'd say it gets 30Nm at the axe. Can't decided if that's too high or low, so I guess its close.