Mamba Monster cutting out at full throttle.....

[BrianG]

You could also feel your solder connections after a while of running. If they feel warmer than the wires, you could be getting voltage drop on the connections at high currents.

As others have said;

1: Get batteries that can handle the load without as much v drop
or
2: Get higher voltage and higher wind motor. A 10XL or 11XL on 5s or 6s should do nicely.
or
3: Simply gear down. You won't get the same top speed, but your batts will thank you.

[rhylsadar]

hi
yeah very high gearing you have there. that thing must get pretty high amp drawing. gearing down (smaller pinion, bigger spur) would be a first and easy thing to do.
bye
rhylsadar