Flight Tests of the Sikorsky HNS-1 (Army YR-4B) Helicopter 2: Hovering and Vertical-Flight Performance With the Original and an Alternate Set of Main-Rotor Blades, Including a Comparison With Hovering Performance Theory

Author:	Gustafson, F. B.
Year:	1945
Document Type:	N/A
Series:	NACA Wartime Reports
Report Number:	NACA-WR-L-596, NACA-MR-L5D09a
Link:	https://digital.library.unt.edu/ark:/67531/metadc61839/