0018933 23 JuneTest A nose cone with parachute was dropped from a helicopter at an altitude of about 1,500 feet. It was recovered within two and a half minutes after striking the lagoon, and again, 50 ml. of water was found inside. The possibility of impact with the water causing the large rear conical seal to open momentarily now became suspect, This was sug- gested by the rather large volume of water that had entered in a relatively short time, 24 June Test Two nose cones with parachutes were dropped from an altitude of . 1,500 feet in an effort to determine the exact point of water leakage. In the first nose cone, the filter was replaced by a rubber membrane; and both the fore and aft spaces of the nose cone were stuffed with absorbent paper tissue, so any water leaking in would be retained near the point of entry. unit. After recovery, it was found that no water had leaked into this The second nose cone, which was the same one used in the 23 June test, was also stuffed with tissue. However, a normal filter unit was used to separate the sections rather than a rubber membrane, covered, this nose cone was found to be dry inside. When re- There was no difference between recovery conditions on the 23 and 24 June tests, except that the lagoon surface was rough on 23 June and calm on 24 June. GAN prorxe ERC 98 48