0018933 l June Test Three rockets were fired from Site Wilma to test the modified ball joint closure mechanism. The sustainer motor on the first rocket did not ignite, causing the nose cone to remain attached to this unit which fell into the lagoon and sank, with a coral head, inside, system, The second rocket was damaged by impact The third nose cone was recovered intact and was dry This represented a completely successful performance of the It appeared that the problem of water leakage into the nose cone had been solved, 19 June Test Ten rockets were set up for firing at the Walnut cloud. Of these, ° aix were successfully launched (see Section 2. 3. 3}. 20 June Test Because of the presence of water in the Walnut nose cones, two rockets were fired from Wilma to further investigate the cause of leakage, The nose cone of the first rocket failed to separate from the sustainer motor and was destroyed when it hit the reef, The second nose cone was recovered in the lagoon, and 50 ml. of water was found to have leaked into it. It was conjectured at this time that the low ambient temperature (-100 F°) encountered by the rocket at altitude might be freezing and causing distortion s. ring seal of the O- NO SAN PRE Re [ e e n 41