1. Guidelines for Reducing Helicopter Parasite Drag
2. KeysC. N.RosensteinH. “Summary of Rotor Hub Drag Data,” NASA TR NASA CR-152080, 1978.
3. ChurchillG.HarringtonR. “Parasite-Drag Measurements of Five Helicopter Rotor Hubs,” NASA TM 1-21-59L, 1959.
4. Experimental investigation of rotorcraft hub and shaft fairing drag reduction
5. StroubR.YoungL.GrahamD.LouieA. “Investigation of Generic Hub Fairing and Pylon Shapes to Reduce Hub Drag,” NASA TM-10008, 1987.