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NACA-TN-775
Analysis of wind-tunnel data on directional stability and control
Year: 1940
Abstract: INTRODUCTION
As a part of a general investigation directed toward developing a rational system of tail design, a study has been made of available wind-tunnel data on directional stability and control. The main emphasis has been placed on a study of the aerodynamic characteristics of the vertical tail surfaces and their contribution to the static stability and control characteristics of airplanes. Data on the characteristics of yawed fuselages, hulls, wings, wing-fuselage combinations, and wing-hull combinations have also been collected. The purpose of this study has been not to establish the stability and control criterions for satisfactory flight handling characteristics but rather to provide methods for design to specified criterions.
Rudder-effectiveness data were available for 4air planes and 28 models, including two 35-foot-span models of multiengine airplanes. The contribution of the vertical tail to stability, that is, yawing moments for both tail-attached and tail-removed conditions, was available for 17 models. For 4 of the 17 models, yaw tests had also been made of the wing alone and of the wing-fuselage combination.
The study of the force on the vertical tail is an extension of the work of references 1 and 2, which concern the horizontal tail, and considerable use has been made of the methods that they present. Analyses were thus directed toward the determination of the characteristics of the isolated tail surface and the effective velocity and the direction of the air flow at the tail. Analyses of the yawing moments of the wing-fuselage combinations were, in general, much less satisfactory, owing to the inadequacy of methods for evaluating either the contribution of the fuselage and the wing or of the large wing-fuselage interference effects.
As a part of a general investigation directed toward developing a rational system of tail design, a study has been made of available wind-tunnel data on directional stability and control. The main emphasis has been placed on a study of the aerodynamic characteristics of the vertical tail surfaces and their contribution to the static stability and control characteristics of airplanes. Data on the characteristics of yawed fuselages, hulls, wings, wing-fuselage combinations, and wing-hull combinations have also been collected. The purpose of this study has been not to establish the stability and control criterions for satisfactory flight handling characteristics but rather to provide methods for design to specified criterions.
Rudder-effectiveness data were available for 4air planes and 28 models, including two 35-foot-span models of multiengine airplanes. The contribution of the vertical tail to stability, that is, yawing moments for both tail-attached and tail-removed conditions, was available for 17 models. For 4 of the 17 models, yaw tests had also been made of the wing alone and of the wing-fuselage combination.
The study of the force on the vertical tail is an extension of the work of references 1 and 2, which concern the horizontal tail, and considerable use has been made of the methods that they present. Analyses were thus directed toward the determination of the characteristics of the isolated tail surface and the effective velocity and the direction of the air flow at the tail. Analyses of the yawing moments of the wing-fuselage combinations were, in general, much less satisfactory, owing to the inadequacy of methods for evaluating either the contribution of the fuselage and the wing or of the large wing-fuselage interference effects.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:55:04Z | |
| date available | 2017-09-04T17:55:04Z | |
| date copyright | 01/01/1940 | |
| date issued | 1940 | |
| identifier other | FIYIYDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/178212 | |
| description abstract | INTRODUCTION As a part of a general investigation directed toward developing a rational system of tail design, a study has been made of available wind-tunnel data on directional stability and control. The main emphasis has been placed on a study of the aerodynamic characteristics of the vertical tail surfaces and their contribution to the static stability and control characteristics of airplanes. Data on the characteristics of yawed fuselages, hulls, wings, wing-fuselage combinations, and wing-hull combinations have also been collected. The purpose of this study has been not to establish the stability and control criterions for satisfactory flight handling characteristics but rather to provide methods for design to specified criterions. Rudder-effectiveness data were available for 4air planes and 28 models, including two 35-foot-span models of multiengine airplanes. The contribution of the vertical tail to stability, that is, yawing moments for both tail-attached and tail-removed conditions, was available for 17 models. For 4 of the 17 models, yaw tests had also been made of the wing alone and of the wing-fuselage combination. The study of the force on the vertical tail is an extension of the work of references 1 and 2, which concern the horizontal tail, and considerable use has been made of the methods that they present. Analyses were thus directed toward the determination of the characteristics of the isolated tail surface and the effective velocity and the direction of the air flow at the tail. Analyses of the yawing moments of the wing-fuselage combinations were, in general, much less satisfactory, owing to the inadequacy of methods for evaluating either the contribution of the fuselage and the wing or of the large wing-fuselage interference effects. | |
| language | English | |
| title | NACA-TN-775 | num |
| title | Analysis of wind-tunnel data on directional stability and control | en |
| type | standard | |
| page | 53 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1940 | |
| contenttype | fulltext |