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Preliminary Results of a Free-Flight Investigation of the Static Stability and Aileron Control Characteristics of 1/6 Scale Models of the Bell MX-776An investigation of the static longitudinal stability, static directional stability, and aileron control characteristics at transonic and supersonic speeds is being made of 1/6 scale rocket-propelled model of the Bell MX-776. A stability investigation has been made of two symmetrical models with controls undeflected and centers of gravity one-half and one-body diameter, respectively, ahead of the equivalent design center-of-gravity location of the full-scale version. Both models developed large normal-force coefficients in both the subsonic and supersonic ranges which indicated longitudinal instability at low angles of attack. The side-force coefficients were small for both models and indicated that the models were directionally stable. A possible tendency toward dynamic directional instability in the transonic region was indicated by short-period oscillations of the side forces. The results showed a partial-span inboard aileron to be ineffective or to cause negative control in the the transonic region when deflected approximately 5 deg but not when deflected 10 deg. An investigation of drag showed it to increase with a rearward movement of the center of gravity. This indicates an increase in the trim angle of attack as could be caused by a decrease in static stability.
Document ID
20010062500
Acquisition Source
Headquarters
Document Type
Other - NACA Research Memorandum
Authors
Michal, David H. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA United States)
Mitcham, Grady L. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA United States)
Date Acquired
September 7, 2013
Publication Date
July 1, 1949
Subject Category
Aircraft Stability And Control
Report/Patent Number
NACA-RM-SL9D21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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