Accession Number : AD0623628

Title :   CONTROL AND HEAT SHIELD REQUIREMENTS FOR BANK-MODULATED SUPERCIRCULAR ENTRY.

Descriptive Note : Master's thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE INSTRUMENTATION LAB

Personal Author(s) : Brekka,Lawrence T.

Report Date : FEB 1965

Pagination or Media Count : 200

Abstract : Bank modulation for supercircular entry was investigated from a control and heating standpoint. The use of error rates in feedback for pitch and yaw loops rather than inertial rates was shown to produce reaction-jet impulse savings on the order of 80 percent. Heating was investigated for (1) a pointed half cone trimmed at (L/D) max, (2) a blunted half spherecone trimmed at (L/D) max, (3) a blunted half spherecone trimmed at (C)L max-all these with the round side windward - and (4) a delta-winged glider trimmed to give the L/D of configuration (1). These vehicles were considered to have a 12-man payload capacity. The blunted half sphere-cone trimmed at (C)L max required the least heat protection weight. (Author)

Descriptors :   (*ATMOSPHERE ENTRY, MANNED SPACECRAFT), (*HEAT SHIELDS, MANNED SPACECRAFT), (*MANNED SPACECRAFT, CONTROL SYSTEMS), REENTRY VEHICLES, LIFT, DRAG, DESCENT TRAJECTORIES, COMPUTER PROGRAMMING, PITCH(MOTION), YAW, AERONAUTICS, ASTRONAUTICS, CONICAL BODIES, BLUNT BODIES, DELTA WINGS, GLIDERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE