Spinstabilized projectile

Details Spinstabilized projectile Spinstabilized projectile

1987-01-02

1988-07-26

Tudor, Harold J.

Ammunition and explosives

Shells

With igniting means

1022752, 102473, F42B 1312

Patent

active

047592923

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a spin stabilized payload projectile of the type which includes a projectile body, a separatable projectile base, ejectable payloads in the projectile body, a nose fuse, and an ejection charge activated by the nose fuse.
Such a projectile is known from "Waffentechnisches Taschenbuch" [Handbook on Weaponry], published by Rheinmetall, 4th Edition, 1977, pages 491 et seq.
In conventional spin stabilized projectiles having ejectable payloads, the acceleration forces are essentially transmitted over the projectile base, with the rotational acceleration being transmitted by way of a suitable, rotationally secured connection between projectile base and projectile body, e.g. rifling or pins. To initiate the ejection of the payload, a nose fuze actuates an ejection charge which builds up a pressure in the interior of the projectile body so that initially the projectile base is exploded away and then the individual payloads are ejected in succession. Since with conventional spin stabilized projectiles, the moments of inertia of the projectile bases were relatively small, relatively small forces were required to separate them when the ejection phase was initiated. These forces could be absorbed by the conventionally introduced nose fuzes without producing a malfunction.
In recent times, spin stabilized projectiles have been developed and introduced which have a longer range and, compared to conventional projectile bases, have a substantially longer and heavier tail section, since this tail section accommodates the propellant required to increase the range. During firing, this propellant is fired by the propellant charge (igniter) and, during flight of the projectile, reduces the range-shortening effect of gravity. The moments of inertia of such enlarged projectile tail sections are sometimes higher by a multiple than is the conventional custom, so that connections between these novel projectile bases and the projectile body must be able to withstand greater mechanical stresses. But, on the other hand, this is a drawback since during ejection, a stronger ejection charge requires the generation of substantially greater forces to separate the projectile base. It has been found that these greater forces have a disadvantageous influence on the conventional nose fuze, so that failures occur and the payload is not ejected in the expected manner.


SUMMARY OF THE INVENTION

It is the object of the invention to improve the configuration of a spin stabilized payload projectile so that, in spite of the higher ejection pressure required for the ejection, the fuze disposed in the nose of the projectile is not subjected to undue stress.
Based on a projectile of the above described type, this is accomplished by disposing a pressure-reducing element between the ejection charge and the nose fuse.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic sectional view of a conventional spin stabilized payload projectile;
FIG. 2 is a sectional view of the nose region of a projectile configured according to the invention.


DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1 is a schematic representation, partially in longitudinal section, of a conventional spin stabilized payload projectile 10 which comprises an essentially hollow cylindrical body 11 and a projectile base 12 connected with this body in a manner secure against rotation. In this body 11, payloads 13 are packed densely one on top of the other to be ejected by an ejection charge 15 at a certain point of the flight path, the ejection charge in turn being actuated by a fuze 14 disposed in the nose of projectile 10. After a delay preselected by the setting of fuze 14, the latter ignites ejection charge 15, which then generates a high gas pressure in the interior of projectile body 11 to initially separate projectile base 12 from projectile body 11 and then eject, in succession, the payloads 13 from the opening now existing in the tail of the projectile.
As mentioned above, in newly developed spin stabilized payload projectil

REFERENCES:
patent: 2342096 (1944-02-01), Zimmerman
patent: 3368485 (1968-02-01), Klotz
Rheinmetall GmbH publication, "Waffentechnisches Taschenbuch", [Handbook on Weaponry], 4th Edition, (1977), pp. 490-493.

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