The report contains papers presented at the Sixth AFOSR Symposium on Advanced Propulsion Concepts, held at the Bell Aerospace Company, Niagara Falls, New York, 4-6 May 1971. Papers are directed toward providing an assessment of current research involving advanced propulsion concepts, and to systems forecasting from the viewpoint of science and engineering middle-management in aerospace industry, Federal agencies and Department of Defense laboratories. Symposium sections emphasized turbine and ramjet propulsion; air augmented rockets; chemical rockets and hybrids, solid and liquid; space power; nuclear propulsion; and electric propulsion. Volume 2 is classified. (Author).

The report contains papers presented at the Sixth AFOSR Symposium on Advanced Propulsion Concepts, held at the Bell Aerospace Company, Niagara Falls, New York, 4-6 May 1971. Papers are directed toward providing an assessment of current research involving advanced propulsion concepts, and to systems forecasting from the viewpoint of science and engineering middle-management in aerospace industry, Federal agencies and Department of Defense laboratories. Symposium sections emphasized turbine and ramjet propulsion; air augmented rockets; chemical rockets and hybrids, solid and liquid; space power; nuclear propulsion; and electric propulsion. Volume 2 is classified. (Author).

The report contains the papers presented at the Seventh AFCRL Scientific Balloon Symposium held in September 1972. The papers were presented in three sessions: Tethered and powered balloons, balloon-borne experiments, and instrumentation and balloon technology. In the area of tethered balloons, papers were presented on cables, drag and stability characteristics, hull design and analysis, and the results of scientific experiments using tethered balloons as sensor platforms. Papers were presented on a powered spherical balloon and a survey of possible power sources for use by this system. Presentations during the balloon-borne experiments and instrumentation session included manned balloon flights, precision pointing and control platforms and instrumentation, recovery parachute performance, gondola motion analyses, a balloon radar altimeter, and an overview of French scientific ballooning activities. During the balloon technology session a review was made of the flight results and performance of balloons with volumes in excess of 20 million cubic feet, shape and stress analysis of both nonreinforced and reinforced materials, and fabric tinting to increase solar absorptivity.