Saboted projectile with sub-caliber core projectile and discardi

Details Saboted projectile with sub-caliber core projectile and discardi Saboted projectile with sub-caliber core projectile and discardi

1994-01-18

1996-02-27

Tudor, Harold J.

Ammunition and explosives

Projectiles

Composite

F42B 1406

Patent

active

054939747

DESCRIPTION:

BRIEF SUMMARY
The invention relates to saboted projectiles comprising a sub-calibre core projectile and a discarding cage consisting of segments linked to bases by means of webs constituting breaking points, the bases being secured to a pusher means. Such projectiles can attain very high initial velocities and consequently a wide service range. This, however, makes target accuracy all the more important and special measures are required in order to safeguard against the pusher means or the discarding cage adversely affecting the projectile after leaving the barrel.
From the DE-B 1 262 830 for example, a sub-calibre projectile with discarding cage is known, which consists of segments torn away by aerodynamic forces when the projectile leaves the barrel. For the attack of the aerodynamic forces, a conical entry depression is provided in the front end of the cage and abreast with the projectile tip; the effect of the depression is that the impact pressure gives rise to forces in a radially outward direction leading to tearing apart of the segments.
Irrespective of whether the depression is cylindrical or conical, these radially outward forces are not sufficiently evenly distributed over the circumference to safeguard simultaneous tearing apart of the segments. The slightest unevenness, irrespective of whether tearing apart is restricted by breaking points or not, lead to a retroactive effect of the breakaway segments on the projectile, adversely affecting target accuracy.
With very fast projectiles there is the additional problem that the initial velocity approaches MACH-numbers of five or more, which means a hypersonic flow pattern. Hypersonic flow is, inter alia, characterized by leading edge shock waves lying close to the body surface, with the effect that no impact pressure occurs. As a result, the segments fail to come apart at all in extreme cases.
It is therefore an object of the present invention to eliminate retroactive effects of the breakaway segments on the projectile of highest initial velocity, in order to attain highest target accuracy. In particularly, the effect of the air flow should lead to simultaneous separation of the segments, with the segments enclosing equal angles between them during separation.
To this end, according to the invention, the front end of each segment has two surfaces inclined at an angle to each other forming a ridge in the plane of symmetry of the segment.
The roof-like configuration of the two symmetric surfaces assures an outwardly directed resultant aerodynamic force precisely in the plane of symmetry of the segments, even with hypersonic flow.
In a development of the invention, the ridge is inclined towards the rear in a radially inward direction. By variation of the angle between the projectile axis and the ridge, the outwardly directed component and the braking effect at the outset of opening can be optimized. An angle of approximately 45.degree. has been established as favourable.
In a further development of the invention, the two surfaces are encircled on their outer circumference by a cylindrical wall. As a result, the rooflike surfaces are protected from damage during handling and loading of the projectile. Damaged ridges could (in particular with segments made from a plastic material) destroy the beneficial effect of the invention.
According to a further feature of the invention, the-segments extend beyond the tip of the core projectile, which they enclose between them. Thus, the tip of the core projectile is protected from damage and dirt and there is more space for the rooflike surfaces.
In a preferred embodiment of the invention, the pusher means impacts the rear end of the core projectile. This further diminishes the danger of the breakaway segments interfering with the core projectile and in case of a wing stabilized projectiles also diminishes the danger of damaging the wings.
According to a further feature of the preferred embodiment, the bases of the segments are secured in the pusher means between a pressure plate and a pressure piece. Holding the bases between

REFERENCES:
patent: 2788744 (1957-04-01), Donner
patent: 4709638 (1987-12-01), Broden et al.
patent: 4850280 (1989-04-01), Wallow et al.

Affiliated with

Also associated with

Rating

Saboted projectile with sub-caliber core projectile and discardi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Saboted projectile with sub-caliber core projectile and discardi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Saboted projectile with sub-caliber core projectile and discardi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1672122