1. ColemanC. P. “A Survey of Theoretical and Experimental Coaxial Rotor Aerodynamic Research,” NASA TP-3675, 1997.
2. The ABC Helicopter
3. PhelpsA. E.MineckR. E. “Aerodynamic Characteristics of a Counter-Rotating, Coaxial, Hingeless Rotor Helicopter Model with Auxiliary Propulsion,” NASA TM-78705, May 1978.
4. ArentsD. N. “An Assessment of the Hover Performance of the XH-59A Advancing Blade Concept Demonstration Helicopter,” U.S. Army Air Mobility Research and Development Lab., TR USAAMRDL-TN-25, Fort Eustis, VA, May 1977.
5. FelkerF. F. “Performance and Loads Data from a Wind Tunnel Test of a Full-Scale, Coaxial, Hingeless Rotor Helicopter,” NASA TM-81329, Oct. 1981.