1. Deformed main blades.
2. Flight vehicle battery
Main rotor spins
depleted
but unable to take
3. Rotor blades installed in
off.
the wrong place
1. Replace rotorblades
2. Charge or replace with fully charged battery.
3. Check whether the rotor blades are mounted
in the correct location, A rotor blade must be
placed on A motor and B rotor blade must be
placed to B motor