three-torque system of control

from The Collaborative International Dictionary of English v.0.48
Three-torque system of control \Three"-torque` system of
control\ (Aeronautics)
   Any system of rudders by which the pilot can exert a turning
   moment about each of the three rectangular axes of an
   aeroplane or airship.
   [Webster 1913 Suppl.]
   [1913 Webster]
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