tail rotor drift — A side force produced by the tail rotor which, unless corrected, causes the helicopter to move sideways on the ground. The main rotor thrust is offset to produce a side thrust to correct for the tail rotor drift. This tendency must be corrected… … Aviation dictionary
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Figure (a)This view is from the rear of the helicopter. A couple is produced by the horizontal component of total rotor thrust and tail rotor thrust causing a rolling tendency to the left.
Figure (b)The vertical lever between the rotor hub and tail rotor is reduced by placing the tail rotor on a pylon.
Figure (c)Offset mast as viewed from the rear.