Improper balance of a helicopter’s load

1. Improper balance of a helicopter’s load can result in serious control problems. In addition to making a helicopter difficult to control, an out-of-balance loading condition also decreases maneuverability since cyclic control is less effective in the direction opposite to the CG location.

- What is the cyclic control?

https://en.wikipedia.org/wiki/Helicopter_flight_controls

The control is called the cyclic because it changes the pitch angle of the rotor blades cyclically. /// The result is to tilt the rotor disk in a particular direction, resulting in the helicopter moving in that direction.// If the pilot pushes the cyclic forward, the rotor disk tilts forward, and the rotor produces a thrust vector in the forward direction.

2. Incorrect weight and balance in helicopters

: 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 becomes worse 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.

This condition is recognizable when coming to a hover following a vertical takeoff. The helicopter will have a nose-low attitude, and the pilot will need excessive rearward displacement of the cyclic control to maintain a hover in a no-wind condition. In this condition, the pilot could rapidly run out of rearward cyclic control as the helicopter consumes fuel. The pilot may also find it impossible to decelerate sufficiently to bring the helicopter to a stop. In the event of engine failure and the resulting autorotation, the pilot may not have enough cyclic control to flare properly for the landing.

https://en.wikipedia.org/wiki/Center_of_gravity_of_an_aircraft