Terminology / Helicopter Aerodynamics Transverse Flow Effect At the beginning of forward flight, angle of attack becomes unequal between the forward and aft portions of the main rotor. Unequal drag and gyroscopic precession causes a noticeable vibration and right rolling of a fuselage. Source: The Way to a Certificate of Helicopter, http://home.att.ne.jp/gamma/fujiwara/index-e.htm

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