In an aircraft, a revoluble thrustproducing system including a hub, a generally radially disposed airfoil blade pivotally secured to and carried by said hub by a corresponding single pitchvarying bladeroot pivot whose axial line of pivotation is fixed in relation to the longitudinal axis of the bladeroot and passes outwardly from said hub on the back or pressure side of the airfoil blade in a generally radial direction and diverges from the airfoil blade as it goes outwardly from said hub, and passes through the stable region of the resultant airload vectors of the airfoil.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jul 1, 1941
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