Update: I put on the e-flite motor, and it works well. For the 3S li-poly, I set the throttle end point to draw 8 amps. Perofrmance is better than the stock motor at 9 amps. But 8 is still too much for the thunder power 1320 3S and the Kokam 1500 2S packs. They only discharge 1/2 capacity or less before the voltage drops. Does anyone make a speed 400 motor optimized for 11 volts? It would draw less amps for the same power (watts).