With planning like that, HOW can it fail to go? - I wait in awe
It's the BL1609. The 9t definitely works better than the 11t - for my setup. Tried both, and couldn't get hold of a 10 quickly enough when the motor came.
And now reading up on the 130x: seems a good alternative, as I really have nowhere to fly indoors (carport is nearest option).
(Also old fingers, which don't work so well on very small helis!)