4,911 research outputs found
Wind-tunnel Investigation at Mach Numbers from 0.6 to 1.4 of Several Ejected Pilot-seat Models
The effects of amount and type of camber on the variation with Mach number of the aerodynamic characteristics of a 10-percent-thick NACA 64A- series airfoil section
Effects of Sting-support Interference on the Drag of an Ogive-cylinder Body with and Without a Boattail at 0.6 to 1.4 Mach Number
Aerodynamic Characteristics at Subsonic and Supersonic Mach Numbers of a Thin Triangular Wing of Aspect Ratio 2 I : Maximum Thickness at 20 Percent of the Chord
Wind-tunnel Investigation of a Tailless Triangular-wing Fighter Aircraft at Mach Numbers from 0.5 to 1.5
Effects of Sweep and Taper Ratio on the Longitudinal Characteristics of an Aspect Ratio 3 Wing-body Combination at Mach Numbers from 0.6 to 1.4
Effects of Systematic Changes of Trailing-edge Angle and Leading-edge Radius on the Variation with Mach Number of the Aerodynamic Characteristics of a 10-percent-chord-thick NACA Airfoil Section
Preliminary Investigation of Impact on Multiple-Sheet Structures and an Evaluation of the Meteoroid Hazard to Space Vehicles
Small pyrex glass spheres, representative of stoney meteoroids, were fired into 2024-T3 aluminum alclad multiple-sheet structures at velocities to 11,000 feet per second to evaluate the effectiveness of multisheet hull construction as a means of increasing the resistance of a spacecraft to meteoroid penetrations. The results of these tests indicate that increasing the number of sheets in a structure while keeping the total sheet thickness constant and increasing the spacing between sheets both tend to increase the penetration resistance of a structure of constant weight per unit area. In addition, filling the space between the sheets with a light filler material was found to substantially increase structure penetration resistance with a small increase in weight. An evaluation of the meteoroid hazard to space vehicles is presented in the form of an illustrative-example for two specific lunar mission vehicles, a single-sheet, monocoque hull vehicle and a glass-wool filled, double-sheet hull vehicle. The evaluation is presented in terms of the "best" and the "worst" conditions that might be expected as determined from astronomical and satellite measurements, high-speed impact data, and hypothesized meteoroid structures and compositions. It was observed that the vehicle flight time without penetration can be increased significantly by use of multiple-sheet rather than single-sheet hull construction with no increase in hull weight. Nevertheless, it is evident that a meteoroid hazard exists, even for the vehicle with the selected multiple-sheet hull
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