,—_ (MCHAWK) Project 5.9 ~ Weapon Effects on Missile Structures and Materials ist Lt C. J. Cosenza OBJECTIVE The primary purpose of this exposure was to compare the effectiveness of lower temperature and longer time thermal inputs from a high yield shot with those from a lesser yield shot. INSTRUMENTATION A light weight 150 foot tower was erected at a range of 525 feet from ground zero for the purpose of exposing nine spherical specimens. Two 10 inch steel spheres were suspended from a beam at the 70 foot level, At the top of the tower was mounted an array consisting of two 10 inch and two 8 inch steel spheres, one 10 inch aluminum svhere and two 9 inch steel spheres containing several inserts of various materials. RESULTS No results are available at this time. The radiation level of the recovery area is so igh that no specimens have been retrieved. Aerial photographs have been taken to preserve, for future use on recovery, any evidence of the penetration of the specimens into the ground. oprnlo® a bon ae - 48 - U ¢