The Space Systems Laboratory of Kyushu Institute of Technology has been studying unmanned suborbital winged rocket as a research subject of future fully reusable space transportation system since 2005. The flight tests of a small scaled winged rocket were conducted five times from 2008 to 2009. A larger winged rocket with a hybrid rocket developed by Hokkaido University, which will reach to a higher altitude, is under development for validating INS/GPS hybrid navigation system, real time trajectory generation and guidance algorithm using GA implemented on FPGA, H_∞ and adaption control theory. This paper reports current design, development and flight test plan of the winged rocket.