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Testing of a sub-scale scramjet research engine model was carried out in the March 6 Ramjet Testing of a sub-scale scramjet research engine model was carried out in the March 6 Ramjet Engine Test Facility of the National Aerospace Laboratory, Kakuda Research Center. By attaching a Engine Test Facility of the National Aerospace Laboratory, Kakuda Research Center. By attaching a short strut on the top wall, intensive combustion with high combustion efficiency was attained, and short strut on the top wall, intensive combustion with high combustion efficiency was attained, and the engine-produced thrust canceled the drag. The flame was held in the low-velocity region around the engine-produced thrust canceled the drag. The flame was held in the low-velocity region around the step, even after the ignitors had been turned off. When the fuel flow rate was small, there was a the step, even after the ignitors had been turned off. When the fuel flow rate was small, there was a different combustion mode with weak combustion and little thrust. Tangential injection of fuel intendifferent combustion mode with weak combustion and little thrust. Tangential injection of fuel intensive combution. sive combution.