2002 July 14 - 01:34 GMT - Launch Vehicle: S. FAILURE: Failure. National Experimental Supersonic Transport NEXST-1 test Agency: NAL. Apogee: 0 km ( mi). The intention was that an 11.5-m-long, one tenth scale model of the aircraft would be propelled by the NAL-735 solid rocket booster to Mach 2 at 18 km altitude. Instead the vehicle lost stability and crashed near the launch point.