antitorque rotor

[an-tee-tawrk, an-tahy-]

an·ti·torque ro·tor

[an-tee-tawrk, an-tahy-]
noun Aeronautics.
(on certain helicopters) a small rotor on the tail, turning in the vertical plane and providing a thrust whose torque opposes and compensates for the torque of the main rotor.

Origin:
anti- + torque
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Antitorque rotor is always a great word to know.
So is spring constant. Does it mean:
proportionality between applied force and resulting change in length of a given spring
coefficient of substance's elasticity expressing ratio between shearing stress and shearing strain
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