The inclination of the main rotor force from it's vertical position:
~ reduces lift force to the benefit of trust force
~ result is a loss of altitude

Due to transverse airflow, additional forces induce a tendency of helicopter to
~ >pitch, when in >longitudinal motion
~ >roll when in >lateral motion

Tail rotor force may cause >lateral motion and a rolling moment.
This induces a drift in helicopter's horizontal and vertical motions.


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