Comparison of Calculated and Measured Helicopter Rotor Lateral Flapping Angles

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Abstract
Calculated and measured value of helicopter rotor flapping angles in forward flight are compared for a model rotor in a wind tunnel and an autogiro in gliding flight. The lateral flapping angles can he accurately predicted when a calculatian of the nonuniform wake‐induced velocity is used. At low advance ratios, it is also necessary to use a free wake geometry calculation. For the cases considered, the tip vortices in the rotor wake remain very close to the tip‐path plane, so the calculated values of the flapping motion are sensitive to the details of the wake structure, specifically the viscous core radius of the tip vortices.

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