Additional studies of the stability and controllability of an unswept-wing vertically rising airplane model in hovering flight including studies of various tethered landing techniques Page: 10 of 27
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( r fe~ .nc. 1 and 2>) the ailerons. had been c:tYrolled automaticaly by
a di spl acems nt..... type autopiot The p pose f ...the present tests was to
evaluate the cont :r.o lability of the model in roll when it was contirolledn.
by a human pilot. The results obtained from these tests were also in
the form of qualitative observations of the controllability of the model
by the pilot,
In addition to these three phases of the investigation, which were
conducted in still air, the investigation also included flight tests of
the model to determine its behavior in gusty air, Some of these tests
were made outdoors and some were made at .low speeds in the return pas
sage of the Langley full-scale tunnel. Only qualitative indications
of the controllability and general flight behavior were obtained in
this part of the investigation
Sketches are presented in figure 5 to illustrate the various landing
techniques involving the use of lines for pulling the model in for a
landing. For the technique shown in figure 5(a), the model was pulled
horizontally into a saddle by means of a line attached near the center
of gravity of the model, The line was actually attached on the surface
of the fuselage at the longitudinal station at which the center of
gravity was located; that is, the attachment point was on the Z-axis at
the surface of the fuselage. In making landings by this technique the
pilot trimmed the elevator to pitch the model away from the saddle so
that the line was always in tens ion4 For the wing-tethering technique
shown in figure 5(b),d the model was pulled down by means of two ines
attached to its wing tips at the 0.10-chord station. These lines passed
through rings on the ground that were farther apart than the atta chment
points on the wing in order to provide stability of attitude. In making
landings by this technique the power operator applied some excess power
and the model was pulled down by means of the tethering lines. For the
tail-tethering technique shown in figure 5(c) the model was pulled down
by means of a line attached to its tail, In making landings by this
technique, as in the case for the wing-tethering technique, excess
power was applied to the model and it was pulled down by means of the
tethering line. Only qualitative indications of the controllability
and general flight behavior were obtained for the landing investigation.
RESULTS AND DISCUSSION
The initial tests of the model, described in reference i, were made
for two center-of-gravity locations to show the effect of center-of-
gravity location lecatse the proper location had not been det i Lo - ned at
CONE IDENT IALI
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Bates, William R.; Lovell, Powell M., Jr. & Smith, Charles C., Jr. Additional studies of the stability and controllability of an unswept-wing vertically rising airplane model in hovering flight including studies of various tethered landing techniques, report, November 6, 1951; (digital.library.unt.edu/ark:/67531/metadc58981/m1/10/: accessed March 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.