lf the Centre of Gravity (CG) is located aft of the rotor hub, when the helicopter lifts to the hover...
A forward CG may occur when a heavy pilot and passenger take off without baggage or proper ballast located aft of the rotor mast. This situation worsens if the fuel tanks are located aft of the rotor mast, because as fuel burns the weight located aft of the rotor mast becomes less.
Aft CG occurs when a lightweight pilot takes off with heavy baggage or ballast located aft of the rotor mast. This situation worsens if the fuel tanks are located aft of the rotor mast, with full fuel.
Lateral CG limits can be restrictive particularly on light helicopters. Solo pilot operations may require seat interchange depending on fuel tank location and load. Lack of lateral cyclic control can lead to the same problems encountered with excessive forward and aft CG.
When the CG is aft of the rotor hub the helicopter will be heavier towards the back and thus, in a hover it will have a nose up attitude.
NOTE:
For cyclic position and CG limits, a good rule of thumb is that cyclic correction is opposite of CG position, both laterally and longitudinally.
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