Project 5.7 - Thermal Flux and Albedo Measurements from Aircraft Capt R,. L. Dresser OPIFOTIVE The objective of Project 5.7 participation on this shot was to Obtain thermal flux and albedo information of a nuclear detonation with airborne calorimeters, radiometers, and sixteen millimeter motion picture cameras. INSTRIMENTAT TION Instrumentation within the purview of Project 5.7 which was installed in the B-47 inclujed nineteen NRDL calorimeters and two NRDL radiometers for measuring the direct and surface reflected thermal radiation, Six calorimeters were utilized to measure ther- ma] radiation which was back-scattered toward the cockpit, Seven GSAP N-9 cameras were utilized to obtain photographic coverage of the fireboll, the earth's surface, and of clouds beneath the air- eraft, and also of any reflecting surface such as a cloud which could contribute to the back-scattered radiation. Project 5.7 instrumentation on the B-52 included the twenty-one basic instruments for thermal radiation measurements, but only an additional two instruments were utilized for back-scatter measurements. Eight GSAP cameras were installed for photographic coverage. Project 5.7 instrumentation on the B-57 consisted of the basic twenty one instruments and six cameras, Project 5.7 instrumentation on the B-66 consisted of the basic Ca ‘a . kt RO ’