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A large-scale STOL transport model with an advanced internally blown jet flap (AIBF) was investigated in the NASA Ames 40-by 80-ft Wind Tunnel. Aerodynamically, the AIBF system combines the benefits of the jet flap and the mechanical flap with boundary-layer control. Structurally, it creates its own spanwise air duct with the deflection of the mechanical flap. An additional short-chord, fast-acting control flap located at the jet-flap exit provides a powerful means for flight-path and lateral controls. The results showed that the overall effectiveness of the AIBF compared well with other jet flap propulsive-lift systems. A preliminary design and performance study was made of a medium-size, turbofan-powered AIBF STOL transport for a typical military mission. This study showed that the AIBF results in a configuration with a relatively low Tl W ratio, making the system an attractive candidate for future designs.

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