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Torque Reaction

Torque Reaction

  • Torque reaction involves Newton’s Third Law of Physics— for every action, there is an equal and opposite reaction.
  •  As applied to the aircraft, this means that as the internal engine parts and propeller are revolving in one direction, an equal force is trying to rotate the aircraft in the opposite direction.
  • When the aircraft is airborne, this force is acting around the longitudinal axis, tending to make the aircraft roll.
  • to compensate for the roll tendency, some of the older aircraft are rigged in a manner to create more lift on the wing that is being forced downward.
  •  The more modern aircraft are designed with the engine to offset to counteract this effect of torque.
  • NOTE: Most United States-built aircraft engines rotate the
  • propeller clockwise, as viewed from the pilot’s seat. The
  • discussion here is with reference to those engines.
  • Generally, the compensating factors are permanently set so that they compensate for this force at cruising speed, since most of the aircraft’s operating lift is at that speed.
  • However, aileron trim tabs permit further adjustment for other speeds.

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