Large transport 33,000-lb X-18 research aircraft, built by Hiller Aircraft Corp for U S Air Force having main 5000-bhp Allison T-40 turboprop engines, 16 ft diam, 6-blade Curtiss dual rotation propellers, and Westinghouse J-34 turbojet engine used for hovering, pitching control; arrangement of possible 30,190 lb gross weight, 4-engine aft loading, transport Propelloplane; advantages. See Engineering Index 1958, p 552 under Helicopters -- Design.
Tilt wing Propelloplane potentialities
Am Helicopter Soc -- J
American Helicopter Society -- Journal ; 4 , n 1
1959
5 pages
Aufsatz (Zeitschrift)
Englisch
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