Hi all,

So I got my MX400 set up perfectly (or so I thought). It has an Ultrafly C/13/33 motor and an Electrifly LiPo 1500mah battery and an Ultrafly 25amp speed control.

The problem is, with a fully charged battery, the heli will only hover for about 30 seconds before the battery cutoff voltage is reached and the motor turns off.

All the linkages and swashplate and tail slidder have been checked and are sliding perfectly. There is no binding anywhere. I tried swapping out the servos. No improvement. The pinion on the motor is not binding and the belt drive is not to tight.

Can anyone give my a clue as to what is happening here?

Thanks,
Jim