The data obtained during an investigation of the effects of crossflow on the suckdown and fountain effects induced by various arrangements of vertically impinging jets are presented in this report. The jet arrangements included circular and rectangular jets in various single, dual and triple jet configurations. The tests were conducted in the 14 by 22 foot tunnel at the NASA Langley Research Center. Tests covered a range of heights above the ground, nozzle pressure ratios, and forward velocities.

The data obtained during an investigation of the effects of the ground vortex on a generic wing-body configuration are presented in this report. Circular, rectangular and thrust reverser jets were tested. The tests were conducted in the 14 by 22 foot tunnel at the NASA Langley Research Center. The tests covered a range of heights above the ground, forward velocities, and ground belt speeds.

The unique characteristics of V/STOL flight bring with it unique aerodynamic challenges. Intended for the working professional or those in engineering graduate programs involved with V/STOL, this book provides information on the aerodynamic effects induced by the exiting flows of jet and fan powered V/STOL aircraft in hover and transition flight.