HELICOPTER SHAFT FORCE MEASUREMENT SYSTEM
CORNELL AERONAUTICAL LAB INC BUFFALO NY
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The development of instrumentation to measure shaft shear and tension forces was undertaken to aid in the measurement of the rotor shaft forces on an HU-1 helicopter to be tested in the 40 foot by 80 foot wind tunnel at the NASA Ames Research Center. Since it is not possible to measure the rotor-fuselage interaction forces on the wind tunnel balances, it was necessary to measure the main rotor shaft forces. These forces are the only direct measurement of the interaction between the fuselage and rotor system. Strain gages were mounted on the rotor shaft to measure directly the strains resulting from shear and tension forces.
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