weerey r os Project 5.8~ In-Flight Participation of an A3D-1 Aircraft LCDR P. S. Harward OBJECTIVE Project 5.8 objective is to measure the thermal response of the A3D-1 aircraft to high yield nuclear detonations. INSTRUMENTATION Instrumentation of the A3D-1 for CHEROKEE) consisted of thermocouples located at critical points on the aircraft skin, Additional thermocouples were used to measure the temperature of various specimens mounted on a special rack on the underside of the fuselage, 4 Calorimeters and radiometers were utilized to measure the direct and indirect thermal effects, Five calorimeters and one radiometer, mounted in the tail turret, were positioned at the correct angle of declination to afford direct field of view of the fireball. Similar thermal instruments were mounted vertically for measuring indirect thermal effects. GSAP cameras were mounted with each group of thermal instruments to provide information on the field of view of the thermal instruments and the terrain and cloud cover below the aireraft, Additional instrumentation included pickups to determine the aerodynamic effects on the aircraft's stability and calibrated air pressure pickups to measure overpressure. AIRCRAFT POSITION IN SPACE For EEE6:20) the A3D-1 aircraft was on an abort heading of 215° absolute altitude, 34,100 feet; horizontal dis- .cOPIED/DOE LANL RG / ~ 65 =, { LO