CHAPTER 2 SUMMARY OF EXPERIMENTAL PROGRAMS 2.1 2.1.1 TASK UNIT 3, DOD PROGRAMS Program 1, Blast and Shock The blast and shock projects on Operation Redwing were planned primarily to obtain data for which there was an urgent need and which could” not be obtained at NTS. Participation was planned for specific types of shots in the kiloton yield range as well as the megaton range. D ’ the air burst of a device heldthe highest priority for Program 1 participation. 1.1 ¢T Ee All five participating projects were seriously affected by the gross positioning’error in air zero. It was planned to obtain free-air data vertically above the burst through a nonhomogeneous atmosphere out to an overpressure of 1 psi. The shockphotography method of obtaining pressure-distance data to about 10 psi suffered almost complete loss owing to the placement of air zero far out of the line of sight of the cameras. Laboratory analysis of the film, supplemented with that from other projects, may produce some data. Data were — recorded from parachute-borne canisters placed in a vertical array over intended air zero in order to document pressure in the range from about 20 out to 1 psi. However, photography is not able at this time to give the position of the canisters in space, and the method used gives pressure data corresponding to a somewhat higher yield than the yield estimates now assigned to the device. Surface gages, aligned along the reef east of Namu, did not attain a gradation of range from actual air zero. Recorded pres- sure data are bunched in a range of only 5 to 10 psi. At present there is an anomaly between data recorded by gages located along the reef itself and those on the man-made islands and Yurochi. Drag gages and dynamicpressure~recording pitot static gages, oriented towards intended GZ, received - 27 - AFWLIH 25