Investigation of a tilting-wing vertical-take-off-and-landing jet airplane model in hovering and transition flight Page: 2 of 22
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NASA Technical Libra
NACA RM L58F26 3 1176014380662
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
INVESTIGATION OF A TILTING-WING
VERTICAL-TAKE-OFF-AND-LANDING JET AIRPLANE MODEL
IN HOVERING AND TRANSITION FLIGHT*
By Robert H. Kirby and James L. Hassell, Jr.
This paper presents the results of an investigation of the dynamic
stability and controllability of a proposed supersonic-cruise, vertical-
take-off-and-landing airplane configuration. The configuration employs
a tilting wing and engines to accomplish vertical take-off and landing
while maintaining a fuselage-level attitude. The wing, which is effec-
tively a flat nacelle housing six jet engines, has an aspect ratio of 1.07.
The investigation showed that the configuration had satisfactory
take-off, landing, and hovering characteristics. It was possible to
perform the transition from hovering to normal forward flight, but the
stability and control characteristics of the model in this flight range
were considered unsatisfactory. In the transition range the wing inter-
ference and downwash of the low-aspect-ratio tilting wing on the hori-
zontal tail were so critical that satisfactory longitudinal stability
and trim could not be achieved over the entire speed range from hovering
to normal forward flight with any horizontal-tail size or height which
was considered practical. Unstable lateral oscillations were also
encountered at several stages of the transition and it was necessary to
use artificial stabilization in roll and yaw to enable the pilots to
control the model.
A research program is being conducted at the Langley Aeronautical
Laboratory to determine the characteristics of a proposed supersonic-
cruise, vertical-take-off-and-landing (VTOL) airplane configuration.
The configuration employs the tilting-engine-and-wing-concept to accom-
plish vertical take-off and landing while maintaining a fuselage-level
Title, Unclassified. i: . '
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Kirby, Robert H. & Hassell, James L., Jr. Investigation of a tilting-wing vertical-take-off-and-landing jet airplane model in hovering and transition flight, report, August 26, 1958; (digital.library.unt.edu/ark:/67531/metadc64343/m1/2/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.