tail rotor roll


tail rotor roll
The rolling moment produced by the tail rotor drift correction force when the tail rotor is mounted on the fuselage below the horizontal level of the main rotor hub. This tendency can be overcome by the reduced couple lever arm. This can be achieved by raising the level of the main rotor by placing the tail rotor on a pylon (Figure b). The other method is to offset the mast (Figure c). See also tail rotor drift.
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.

Aviation dictionary. 2014.

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