Program Manager Al Bowers and the Wind Tunnel Configuration used for Researching a Model of the PRANDTL-d.

prandtl_wing_6

Based on information from the first two Preliminary Research Aerodynamic Design to Lower Drag, or PRANDTL-d, test flight vehicles, Langley engineers designed and built a six-foot-span wind tunnel model. Some modifications were needed at the center of wing to accommodate the addition of strain gauges and properly balance the model to accurately collect forces and moments data.

2015
Submitted photo courtesy of David C. Bowman