Flight tests of the Sikorsky HNS-1 (Army YR-4B) helicopter ; Part 1: Experimental data on level-flight performance with original rotor blades
Wartime report ; L-595
1945
14 S., [20] Bl
Ill., graph. Darst
Originally issued March 1945 as Memorandum report L5C10
Buch
Englisch