The 9x15 low speed tunnel tests take off and landing of aircraft.  The laser velocimetry system for flow measurement show here, with the color blue and green lasers, measures engine exhaust that comes back up from the ground.  The STOVL model n the 9x15 low speed wind tunnel, building 39, is similar to the British Harrier aircraft.
GRC-1994-C-00158
The 9x15 low speed tunnel tests take off and landing of aircraft.  The laser velocimetry system for flow measurement show here, with the color blue and green lasers, measures engine exhaust that comes back up from the ground.  The STOVL model n the 9x15 low speed wind tunnel, building 39, is similar to the British Harrier aircraft.
STOVL (Short Take Off Vertical Landing) Phase III Hot Gas Ingestion Into Engine Intake Test in the 9x15 Low Speed Wind Tunnel