One of the goals of the flight test with the Supersonic Experimental Airplane (NEXST-1) is to substantiate supersonic drag reduction technology with a CFD-based optimum aerodynamic design procedure. Another goal is to establish experimental flight test technology with unmanned airplane. The second flight testing of the NEXST-1 has been successfully conducted on 10 October, 2005 at Woomera Test Range, Woomera Prohibited Area, South Australia. In this report, overview of the experimental system and design and the substantiation for system requirements from flight test data are reported.