Japanese researchers in Kiruna, Sweden, are preparing to restage the drop test of a supersonic transport model from a high-altitude balloon to demonstrate a low sonic boom.  The month-long test period at the Esrange Space Center begins on July 22. The first test under Phase 2 of the Japan Aerospace Exploration Agency’s (JAXA) D-Send program failed on Aug. 16, 2013, when the 7.9-meter (26-ft.) long model veered off course after release from the balloon at 30 km. (98,500 ft.) ...


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