* AM A Al AA 99-1042 Measurements of the Progress-M Main Engine Retrofiring Plume at Orbital Conditions G. F. Karabadzhak, Yu. Plastinin, A. Afanasiev, and E. Szhenov TsNIIMASH, Korolev, Russia J. A. Drakes, W. K. McGregor, J. A. Nichols, and R. A. Reed Sverdrup Technology, Inc., AEDC Group Arnold Engineering Development Center Arnold Air Force Base, Tennessee 37389 SsSoid AFB, TN 19991130 103 V. Teslenko, N. Shvets, 0. Volkov, and V Kukushkin RSC Energia, Korolev, Russia 37th AIAA Aerospace Sciences Meeting & Exhibit January 11 -14,1999 / Reno, NV For permission to copy or republish, contact the American Institute of Aeronautics and Astronautics 1801 Alexander Bell Drive, Suite 500, Reston, VA 22091