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This paper explores the benefits of providing telescopic span morphing in HALE UAV for extending its endurance, while retaining its performance in other flight segments such as climb rate and take-off/landing. An existing methodology for initial sizing and constraint analysis has been used with Global Hawk RQ4-A as the baseline aircraft and a modified Global Hawk with requirement for additional endurance...
There will be a big load on the structure after aircraft ditching and spacecraft water recycling, which has an important effect on the safety of the capsule structure and the people inside. Therefore the research of water impact has a practical significance. Base on the wedge and arc body model, the test of the body free falling on the water has been vertically investigated. The acceleration signals...
In this study, mechanical properties of B4C particulate reinforced AA6061 matrix composites produced by powder metallurgy were investigated and their ballistic performances were examined. AA6061 matrix particles have been mixed with B4C particle for 45 minute and cold pressed under 400 MPa. The pressed compacts have been sintered at 550oC for one hour, and then were extruded at the same temperature...
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