This facility assesses conventional performance for low-speed tests of powered and unpowered models of various fixed- and rotary-wing civil and military aircraft over a wide range of takeoff, landing, cruise and high angle-of-attack conditions. The tunnel can be easily reconfigured for acoustic, tethered free-flight and forced-oscillation (dynamic stability) testing, as well as for motor-sports studies. Investigators can chose from either closed (walls, ceiling and floor) or open (floor-only) test-section arrangements.
Initially named the V/STOL Tunnel and, later, the 4 X 7 Meter Tunnel, the facility was constructed in 1970 to provide an improved understanding of the aerodynamics of vertical/short takeoff and landing (V/STOL) aircraft. Studies concentrated on the strong downwash generated by the V/STOL model-lift fans or jets, and the interaction of the boundary layer with the vertical or forward-facing, propulsion-flow components.
An extensive modification was completed in 1984 to improve airflow and expand capabilities for both acoustic and rotorcraft testing. In 1999, an automation system and new model carts were added. Major clients have included the Department of Defense and aircraft manufacturers such as Boeing, Lockheed Martin, and Northrop Grumman. Motor sports and vehicular tests have been conducted in cooperation with Old Dominion University.
