George W. Brooks

John L. McCarty

Alfred G. Beswick

Application of Penetrometers to the Study of Physical Properties of Lunar and Planetary Surfaces

John Locke McCarty

Domenic J. Maglieri

A Dynamic Model Investigation of the Effect of a Sharp-edge Vertical Gust on Blade Periodic Flapping Angles and Bending Moments of a Two-blade Rotor

John C. Houbolt

The differential equations of motion for the lateral and torsional deformations of twisted rotating beams are developed for application to helicopter rotor and propeller blades. No assumption is made regarding the coincidence of the neutral, elastic, and mass axes, and the generality is such that previous theories involving various simplifications are contained as subcases to the theory developed and presented in this paper. Special attention is given to coupling terms not found in previous theories, and methods of solution of the equations of motion are indicated by selected examples.

George W. Brooks

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