1. To determine whether a tensioned or pressurized Structure could function as 8 backup sheet without requiring additional protection, a test series was conducted by MSC, in which 0.32-cm-diameter glass spheres were impacted on shielded tanks at 7.0iun/ sec. The tanks Were made of type 6A1-4V titanium alloy and were pressurized with alcohol to 960 Ih/ in to develop a hoop stress of 90 000 Ih/in . Aluminum shields were placed 1 inch from the tank
2. NkA TR 65-48, 19'65. '