Air-Stream Surveys in the Vicinity of the Tail of a 1/8.33-Scale Powered Model of the Republic XF-12 Airplane Page: 4 of 51
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NACA EM No. LTD09.. a - 3
angle of yaw
5B f flap deflection
S wing area
qt local dynamic-pressure at tail
qt/q dynamic-pressure ratio at tail
E local dowash angle at tail, positive when velocity
--comporne normal to direction of free-strean
velocity is downward
a local sidewash angle at tail, positive when horizontal
velocity component is to left, Viewed from rear
St area of horizontal tail of model (projected)
bt span of horizontal tail of model (projected)
at . local. chord of horizontal tail
. MODl AND D APPARATUS
The 1/8.33-scale powered -model of the XF-12 airplane is shown
mounted on the single support in the Langley 19-foot pressure tunnel
in figure I. A three-view drawing of the model is presented in
figure 2, and a complete description of the model and its c nponents .
are given in rein fereferences .1 and 2. The horizontal and vertical tail..
and after' portion.of the fuselage were replaced by a fuselage tail.
cone during this part of the investigation.
The Langley 19-foot pressure tunnel air-stream rake was
employed to measure dynamic pressure, dowtwash angles, and sidewash
angles." The rake, which had been.previously calibhated through a
known pitch ,and yaw range, consists of six: pitbt-static tubed with
pitch and.. yaw orifices (two each) drilled- in.-the hemispheIrial tips
at 450 to the longitudinal tube axes and 900 "to each 'ther. The
tubes, which are Brlned in vertical plane and are spaced 3, inches
apart (fig. 3), were, connected to a multiple tube manatcuster. IThe
manameter readings were recorded during the tests by means of a camera.
The mechanism of the survey-trut carriage allowed only planes to be
traversed that were perpendicular to the longitudinal axis of the
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Foster, Gerald V. Air-Stream Surveys in the Vicinity of the Tail of a 1/8.33-Scale Powered Model of the Republic XF-12 Airplane, report, April 8, 1947; (digital.library.unt.edu/ark:/67531/metadc64217/m1/4/: accessed February 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.