AN ANALYTICAL INVESTIGATION OF SHALLOW ATMOSPHERIC ENTRY.

Abstract : Several empirical and approximate analytical so lutions are given for shallow ballistic reentry. These solutions include a consideration of ballistic parameters from 100 to 6,000 lbs/sq ft. The results of these solutions are compared with digital computer results and with AFSWC TDR-6250. These comparisons show good agreement with the apparent gross characteristics of shallow angle, near-orbital-velocity reentry. The wall temperature due to aerodynamic heating was calculated for several materials using digital computer trajectories. In addition, the range deviation due to finite stability characteristics was investigated. The reentry path calculations are based on an analytical model which simulates a rotating oblate earth, and utilizes the 1959 ARDC atmosphere. (Author)