Stability and control flight tests of a 0.13-scale model of the consolidated-Vultee XFY-1 airplane in take-offs, landings, and hovering flight: TED No. NACA DE 368 Page: 3 of 30
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NACA RM SL52126
At the request of the Bureau of Aeronautics, Navy Department, an
investigation is being conducted to determine the dynamic stability and
control characteristics of a 0.13-scale flying model of the Consolidated-
Vultee XFY-1 vertically rising airplane. This airplane has a modified
triangular wing and modified triangular vertical tail surfaces mounted
symmetrically above and below the fuselage, and has no horizontal tail.
It has a large dual-rotating propeller and sufficient power to take off
and land vertically. Control is provided by flap-type elevons and rud-
ders operating in the propeller slipstream.
The results of an investigation with a somewhat similar model are
covered in reference 1. This model was a simplified version of the
XFY-1, which was similar with regard to the plan form of the wing and
tail surfaces and with regard to the size and location of the propellers.
The investigation with this simplified model was a preliminary measure
to obtain an indication of the control characteristics of the XFY-1 air-
plane long before an exact scale model could be built and a detailed
investigation completed. Some results of a series of flight tests on a
more conventional vertically rising airplane configuration are presented
inre rencesi 2 2to -
The present paper gives the results of the first phase of the
dynamic stability and control investigation of the XFY-1 model. Included
in this phase of the investigation were: hovering tests at considerable
height above and near the ground, take-offs, unrestrained landings, and
tethered landings using several different tethering techniques. All of
these tests were made in still air. The model behavior at low transla-
tional speeds in gusty winds was also investigated.
The results of the investigation were obtained primarily from the
pilots' observations. In some cases, however, time histories of the
motions of the model were prepared from motion-picture records of the
flights to aid in the study of some particular phase of the model
NOMENCLATURE AND SYMBOLS
In general, the model is considered as a conventional airplane in a
vertical attitude, The controls and motions are referred to in conven-
tional terms relative to the body system of axes; that is, the rudders
on the vertical tails produce yaw about the normal (Z) axis, differential
deflection of the elevons on the wings produces roll about the longitudi-
nal (X) axis, simultaneous up or down deflection of the elevons produces
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Lovell, Powell M., Jr.; Smith, Charles C., Jr. & Kirby, Robert H. Stability and control flight tests of a 0.13-scale model of the consolidated-Vultee XFY-1 airplane in take-offs, landings, and hovering flight: TED No. NACA DE 368, report, October 1952; (digital.library.unt.edu/ark:/67531/metadc59405/m1/3/: accessed March 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.