As part of a propulsion/airframe integration program at Langley Research Center, tests were conducted in the Langley 16-Foot Transonic Tunnel to determine the effects of locating flow-through mixed flow engine nacelles in several aft underwing positions on the longitudinal aerodynamics of a high wing transport airplane. D-shaped inlet nacelles were used in the test. Some configurations with antishock bodies and with nacelle toe-in were also tested. Data were obtained for a free stream Mach number range of 0.70 to 0.85 and a model angle-of-attack range from -2.5 to 4.0 degrees. Abeyounis, William K. and Patterson, James C., Jr. Langley Research Center AERODYNAMIC INTERFERENCE; AIRCRAFT DESIGN; ENGINE AIRFRAME INTEGRATION; TRANSPORT AIRCRAFT; WING NACELLE CONFIGURATIONS; AFTERBODIES; FREE FLOW; MACH NUMBER; MULTIPHASE FLOW; PROPULSION SYSTEM CONFIGURATIONS; SYSTEMS INTEGRATION; TRANSONIC WIND TUNNELS...