 free-flight techniqu high speed aerodynam free-flight techniqu high speed aerodynam develop rocket-born rocket-launch high-speed airplan model test describ detail airborn compon telemet unit track calibr discuss test control drag measur longitudin stabil evalu lift measur pressur measur aeroelast estim sonic bang record effect reynold number involv higher usual wind tunnel extens mach number tunnel limit free tunnel wall interfer 