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Tests of a 1/7-Scale Semispan Model of the XB-35 Airplane in the Langley 19-Foot Pressure TunnelA 1/7 scale semispan model of the XB-35 airplane was tested in the Langley 10 foot pressure tunnel, primarily for the purpose of investigating the effectiveness of a leading-edge slot for alleviation of stick-fixed longitudinal instability at high angles of attack caused by early tip stalling and a device for relief of stick-free instability caused by elevon up-floating tendencies at high angles of attack. Results indicated that the slot was not adequate to provide the desired improvement in stick-fixed stability. The tab-flipper device provided improvement in stick-free stability abd two of the linkage combinations tested gave satisfactory variations of control force with airspeed for all conditions except that in which the wing-tip "pitch-control" flap was fully deflected. However, the improvement in control force characteristics was accompanied by a detrimental effect on stick-fixed stability because of the pitching moments produced by the elevon tab deflection.
Document ID
20040085365
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Teplitz, Jerome (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Kayten, Gerald G. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Cancro, Patrick A. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Date Acquired
August 21, 2013
Publication Date
January 16, 1946
Subject Category
Aircraft Stability And Control
Report/Patent Number
NACA-MR-L5L27
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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