PROJECTILE STABILISE EN ROTATION ET CONTENANT UNE CHARGE UTILE

SPIN-STABILIZED PROJECTILE WITH A PAYLOAD

Abrégé anglais

Spin stabilized projectile with a payload. In such
projectiles, the further trajectory of the payload (5) should
not be unfavorably influenced during the expulsion thereof by
parts of the projectile body (1). In order to achieve the
most effective trouble-free expulsion of the payload (5) in
accordance with this invention, the bursting charge is an
explosive charge (17), wherein the explosive charge, in the
radial direction, is in tight contact with the projectile body
(1) and, in the axial direction, is provided with a damping
space (18) relative to a web (7).

Revendications

WHAT IS CLAIMED IS:
1. A spin stabilized projectile having a payload (5)
comprising:
a projectile body (1);
a ballistic cone (2) attached to a front portion of the
projectile body (1);
a utility chamber (4) located within the projectile body
(1), for fixedly retaining the payload (5);
an igniter chamber (6) located behind the utility chamber
(4) of the projectile body (1);
an igniter (3) retained in the igniter chamber (6); and
a bursting charge, separated from the utility chamber (4)
of the projectile body (1) via a web (7), for expelling the
payload (5),
therein characterized, that the bursting charge (17) is
an explosive charge (17), wherein the explosive charge, in the
radial direction, is in tight contact with the projectile body
(1) and, in the axial direction, is provided with a damping
space (18) relative to the web (7).
2. The spin stabilized projectile of claim 1, therein
characterized, that in the region of the utility chamber (4),
reference fracture locations (24) are provided on the
projectile body (1) in the longitudinal direction in order to
achieve a lateral opening of the utility chamber (4), from an
aft portion of the projectile body, via the explosive charge
(17).
3. The spin stabilized projectile of claim 2, therein
characterized, that the payload (5) is comprised of a
plurality of cylindrical subprojectiles (20) of heavy metal,

with the subprojectiles forming coaxially-arranged
subprojectile columns (21) in the utility chamber (4).
4. The spin stabilized projectile of claim 3, therein
characterized, that the projectile body (1), in the region of
the utility chamber (4), has the shape of a hollow cylinder
(22), with the hollow cylinder having additional recesses (23)
in the axial direction, in order, on one hand, to retain the
subprojectiles (20) against rotation, and on the other hand,
to form the reference fracture locations (24).
5. The spin stabilized projectile of claim 4, therein
characterized, that the subprojectiles (20) are fixed, in the
axial direction, via a holding screw (10), provided at the
front portion of the projectile body (1).

Description

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8PIN STABILIZED PROJECTILE WITH A PAYLOAD
The invention pertains to a spin stabilized projectile with a
payload as per the preamble of patent claim 1.
In actual practice, the use of such projectiles, in
combination with an antimissile defense system, has become
known, wherein a flying target is detected and pursued with
fire-control equipment, with automatic followup via an
artillery piece. The projectile flight time calculations are
carried out and at the discharge of the artillery piece in
each projectile, the updated fuse response time is inductively
transferred via a programming spool to the delayed action fuse
in order to assure the expulsion of the payload, for example,
subprojectiles, directly in front of the flying target.
However, during the expulsion of the payload, there is the
danger that the trajectory of the payload will be unfavorably
influenced by either parts of the projectile body or subjected
to an excessive compressive stress by the bursting charge.
It is the task or object of this invention, to assure a
substantially trouble free and uniform expulsion of the
payload. This is accomplished, in accordance with this
invention via the features in the characterizing portion of
patent claim 1.
Also advantageous are the placement of reference fracture
locations in the longitudinal direction in the functional or
utility chamber, as well as the use of a payload of
subprojectiles, the special coaxial arrangement of the
subprojectiles and the securing of same against rotation,
during the projectile acceleration, via recesses in the
projectile body in the region of the utility chamber.

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One exemplary embodiment of the spin stabilized projectile
with a payload is described in detail hereinafter with
reference to the several drawings. Shown are:
Fig. 1 is a longitudinal sectional view through the spin
stabilized projectile of this invention with the projectile
having a payload of subprojectiles;
Fig. 2 is a lateral cross section taken along line II-II
of Fig. 1; and
Fig. 3 is a dispersion diagram of a projectile in
accordance with Figs. 1 and 2.
In accordance with Fig. 1, a spin stabilized projectile
includes a projectile body 1, a ballistic cover or cone 2
attached to a front portion of projectile body 1 and an
ignitor or fuse 3 attached to the aft body or rear section of
projectile body 1, wherein fuse 3, in this example, takes the
form of a programmable delay time fuse 3. It is however quite
feasible to utilize a different fuse or igniter, for example
a distance fuse, whose firing or ignition is accomplished via
a transmission means. Projectile body 1 further includes a
functional or utility chamber 4 for a fixedly retained payload
5, an igniter chamber 6, located behind or aft of utility
chamber 4 and partially separated therefrom by a web 7, a
rotating band 8 and slots or grooves 9, for the attachment of
a non-illustrated but known cartridge case. A holding or
retaining screw 10 fixedly secures payload 5 in the axial
direction and also unites projectile body 1 and ballistic
cover or cone 2. Known delay time fuse 3, affixed in ignition
chamber 6, includes a fuse body 11, a data receiver spool 12,
an energy supply system 13, including a power generator for
example, an electronic delay ignition or time fuse module, an
igniter 15, a detonator 16 and a bursting charge 17.

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In accordance with this invention, the bursting charge 17 is
an explosive charge 17, wherein the explosive charge, in the
radial direction, is in tight contact with the igniter or
rather the delay time fuse 3 and/or with the projectile body
1 and, in the axial direction, is provided with a damping or
attenuating space 18 relative to web 7. If desired, explosive
charge 17 can be located directly in projectile body 1, in
which the ignition chain or circuit must be assured to the
igniter or the delay ignition fuse 3 or the detonator 16. The
damping space 18 can be in the form of an air gap between web
7 and explosive charge 17 in the manner illustrated in Fig. 1,
or, for example, while not illustrated, in the form of a
material, arranged between web 7 and explosive charge 17,
having damping properties for the detonation impulse wave.
In accordance with Figs. 1 and 2, in this exemplary
embodiment, payload 5 is comprised of a plurality of
cylindrical subprojectiles 20 of heavy metal, with the
subprojectiles forming coaxially arranged subprojectile
columns 21 in utility chamber 4. Eight superposed
subprojectiles 20 form one column 21 and nineteen such columns
21, as best seen in Fig. 2, are fixedly secured in the axial
direction in utility chamber 4 via holding screw 10.
Preferably, at the same time, the projectile body 1, in the
region of utility chamber 4, has the shape of a hollow
cylinder 22, with the hollow cylinder additionally having
recesses 23 in the axial direction. As shown in Fig. 2, in
cross section, six eccentric recesses 23, in the form of
sectors of circles, are utilized. By means of these recesses,
on one hand, subprojectiles 20 or rather subprojectile columns
21, are retained adjacently together and, in addition, are
secured against rotation via holding screw 10, as well as' on
the other hand, forming reference fracture locations 24, in

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the axial direction, at the thinnest wall portions of
projectile body 1.
The mode of operation of the spin stabilized projectile is as
follows: Once igniter 16 is ignited, there occurs, via
detonator 16 and explosive charge 17, the expulsion of payload
5, i.e., subprojectiles 20. As a result of the arrangement of
explosive charge 17, the impulse waves of the detonation
function or operate immediately in the radial direction, in
terms of time, and operate in a delayed manner, in terms of
time, in the axial direction. As a result thereof, projectile
body 1 is ripped open laterally in the region of rotating band
8, and the utility chamber 4 is opened laterally, along
reference fracture locations 24 from a rear or aft portion of
the projectile body, for example much in the manner in which
a banana is peeled, and the side portions thereof, aided by
the centrifugal force are flung away. Limited via damping
space 18, payload 5 is only subjected to slight compression,
as a result of which the release of subprojectiles 20 is time
delayed and occurs substantially without interference. The
heavy metal subprojectiles of illustrated payload 5 then fly
singly, in a spin stabilized manner, toward the target in an
acute scattering angle.
Illustrated very well in Fig. 3 is the dispersion diagram of
such a projectile having 152 subprojectiles 20 and shows the
coaxial arrangement of the nineteen subprojectile columns 21,
each having eight subprojectiles 20 in utility chamber 4,
together with the substantially trouble free expulsion
thereof. For example, the bordered point or dot spiral 25
emanates from a subprojectile column 21 located at the largest
or greatest coaxial distance from the projectile axis and
point 26 emanates from a subprojectile 20 that abuts web 7.

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As a payload S, other subprojectiles in other formations and
other arrangements can be utilized or be utilized for the
generation of false targets or rather for blinding or dazzling
of a flying target, or for CHAFF or FLARE payloads.

Dessin représentatif