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Lateral Stability Characteristics of a 1/8.33-Scale Powered Model of the Republic XF-12 AirplaneThe XF-12 airplane is a high-performance photo-reconnaissance aircraft designed for the Army Air Forces by the Republic Aviation Corporation. An investigation of a 1/8.33 - scale powered model was made in the Langley l9-foot pressure tunnel to obtain information relative to the aerodynamic design of the airplane. The model was tested with and without the original vertical tail. and with two revised tails. For the revised tail no. 1, the span of the original vertical .tail was increased about 15 percent and the portion of the vertical tail between the stabilizer and fuselage behind the rudder hinge line was allowed to deflect simultaneously with the main rudder. Revision no. 2 incorporated the increased span, but the lower rudder was locked in the neutral position. For all the tail arrangements investigated it was indicated that the airplane will possess positive effective dihedral and will be directionally stable regardless of flap or power condition. The rudder effectiveness is greater for the revised tails than for the original tail, but this is offset by the increase in directional stability caused by the revised tail. All the rudder arrangements appear inadequate in trimming out the resultant yawing moments at zero yaw in a take - off condition with the left-hand outboard propeller windmilling and the remaining engines developing take-off power.
Document ID
20050019467
Acquisition Source
Langley Research Center
Document Type
Other - NACA Research Memorandum
Authors
Pepper, Edward (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Foster, Gerald V. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Date Acquired
August 22, 2013
Publication Date
February 27, 1947
Subject Category
Aircraft Stability And Control
Report/Patent Number
NACA-RM-L7B21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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