The rotor of the Autogiro is described, as some authorities have considered that this revolving feature has added much in the way of increased safety and utility to the heavier-than-air craft. In the latest designs the Pitcairn Aircraft blade spars have been made of chrome-molybdenum steel. The necessity of attaining rigidity in torsion has determined in some designs the size of the blade main tubular spar. Research during the year has been devoted to mastering this structural requirement. The chief features are flexibility in the plane of lift, rigidity in the plane of rotation, and rigidity in torsion.

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