| 摘要 |
PCT No. PCT/EP85/00433 Sec. 371 Date Jun. 6, 1986 Sec. 102(e) Date Jun. 6, 1986 PCT Filed Aug. 24, 1985 PCT Pub. No. WO86/01584 PCT Pub. Date Mar. 13, 1986.A propellant-charge pack has an annular envelope having an outer wall extending along and centered on an axis, a pair of axially spaced end walls extending transversely inward from the axis and having inner peripheries centered on the axis, and an inner wall defining a clear axially throughgoing passage between the inner peripheries of the end walls. The envelope is generally axially symmetrical about the axis, that is it is formed as a body of revolution or of regular polygonal section, and is substantially symmetrical to a plane perpendicular to the axis midway between the end walls. A relatively easily ignited primer charge forms a part of the inner wall symmetrical of the plane and a propellant charge fills the envelope between the walls outward of the inner wall. The primer charge is of such high combustibility, compared to the diameter of the passage, that the entire primer charge, even of a stack of such packs, will be ignited before they burn through and set off the respective propellant charges.
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