Abstract
The paper dwells on using a gravitation striker (GS) to initiate collections of ejection cartridge primers with dates of manufacture spanning by ca. 12-13 years. During the tests at the energy provided by the GS corresponding to spring firing mechanisms (SFM) of the seat, in the explosive chamber having the volume 460 cm3, there were measured the average values of activation delay time t 410 s and the overpressure 1.0 and 1.8 bar before and after the bouncing and the median energy Eaver required for the initiation of the primers. The increase of Eaver from 290 mJ by ca. 20% during 10 years indicates the fall of sensitivity. The remaining measured values have not shown any clear dependence on the life time. The dependence of activation time delay on the striker initial velocities v0 of ca. 1 m/s to a value of SFM (7-10 m/s) was also investigated. The dependence is close to t ~ 1 / v0 observed for other types of percussion primers.
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