Supersonic Flutter of a 60© Delta Wing Encountered During the Flight Test of a Rocket-propelled Model
Supersonic Flutter of a 60© Delta Wing Encountered During the Flight Test of a Rocket-propelled Model

Author: William T. Lauten

Publisher:

Published: 1954

Total Pages: 26

ISBN-13:

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An analysis of the flight time-history records of a record-propelled 60 degree delta-wing airplane configuration indicate that wing flutter started during the accelerating portion of the flight at a Mach number of approximately 1.7 and continued through the peak Mach number of the test (M = 2.08) and during deceleration at least until telemeter failure at M = 1.4 and probably to an even lower speed. CW Doppler velocimeter data indicated that the wings did not fail during the flight.

Flutter at Very High Speeds
Flutter at Very High Speeds

Author: Harry L. Runyan

Publisher:

Published: 1957

Total Pages: 16

ISBN-13:

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This paper is concerned with a discussion of some of the problems of flutter and aeroelasticity that are or may be important at high speeds. Various theoretical procedures for treating high Mach number flutter are reviewed. Application of two of these methods, namely, the Van Dyke method and piston-theory method, is made to a specific example and compared with linear two- and three-dimensional results. It is shown that the effects of thickness and airfoil shape are destabilizing as compared with linear theory at high Mach number. In order to demonstrate the validity of these large predicted effects, experimental flutter results are shown for two rectangular wings at Mach numbers of 6.86 and 3. The results of nonlinear piston-theory calculations were in good agreement with experiment, whereas the results of using two- and three-dimensional linear theory were not. In addition, some results demonstrating the importance of including camber modes in a flutter analysis are shown, as well as a discussion of one case of flutter due to aerodynamic heating.

Description and Analysis of a Rocket-vehicle Experiment on Flutter Involving Wing Deformation and Body Motions
Description and Analysis of a Rocket-vehicle Experiment on Flutter Involving Wing Deformation and Body Motions

Author: H. J. Cunningham

Publisher:

Published: 1950

Total Pages: 32

ISBN-13:

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Flight tests and a mathematical analysis were made to demonstrate and confirm a type of subsonic flutter involving rigid-body motions and wing deformations. For the configuration considered the period of the oscillation was approximately 100 chords per cycle which is well within the range of period found in dynamic-stability work on rigid aircraft with free controls. A mathematical analysis based on two-dimensional incompressible flow provided a conservative prediction of the airspeed at which the low-frequency flutter occurred. It was found that wing bending stiffness is the important parameter for preventing such flutter.

Aerodynamic Characteristics of a Delta Wing with Leading Edge Swept Back 45 Degrees, Aspect Ratio 4, and NACA 65A006 Airfoil Section
Aerodynamic Characteristics of a Delta Wing with Leading Edge Swept Back 45 Degrees, Aspect Ratio 4, and NACA 65A006 Airfoil Section

Author: William C. Sleeman

Publisher:

Published: 1949

Total Pages: 34

ISBN-13:

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This paper presents the results of the investigation of wing-alone and wing-fuselage combination employing a delta wing having 45 degree sweepback of the leading edge, aspect ratio 4, and an NACA 65A006 airfoil section. Lift, drag, pitching moment, and root bending moment were obtained for these configurations. In addition, effective downwash angles and dynamic-pressure characteristics in the region of a probable tail location also were obtained for these configurations, and are presented for a range of tail heights at one tail length. In order to expedite publishing of these data, only a brief analysis is included.