1. Wheatley, JohnB. and Hood, ManleyJ., Full-Scale Wind-Tunnel Testsof a PCA-2 Autogiro Rotor, NACAReport 515, 1935
2. Wheatley, John B., An Aerodynamic Analysis of the Autogiro Rotorwith a Comparison between Calculated and Experimental Results, NACAReport 487, 1934
3. AIRSPEED FOR AUTOROTATION AT MINIMUM RPM