SEAGNAT Safety and Arming Device

摘要

This report summarizes the design development and testing of a safety and arming (S&D) device for the NATO SEAGNAT time fuze. This S&A device is the result of modifications to the existing M429 safing and arming device. Three major changes were made to the M429 mechanism: (1) the spring-mass system was changed to permit arming at 8 g's; (2) a single pole single throw switch was added. The switch closed at arming and was electrically isolated from the S&A and the outer housing; and (3) the rotor is locked in the safe position to prevent movement prior to the launch signal. All performance and safety requirements were met as could be determined by the testing performed at Hamilton Technology. The device is housed within an aluminum cylinder 1.515 in. dia. by 1.550 in. long with a 2.015 in. dia. mounting flange at one end. The safe or armed condition may be determined through a window at the top of the housing. (Author)