Constant-Width Projectile Geometry for Barrel Sealing and Stability
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Solution Overview
Problem
Conventional barrel-based weapon systems face issues with projectile stabilization, particularly in smooth-bore barrels, where rotation-stabilized projectiles experience centrifugal force dispersion, and rifled barrels suffer from wear and gas leakage due to imperfect seals.
Innovation Solution
Designing projectiles with a cross-section in the form of a curve of constant width, allowing for stabilization without rifling, using a sabot or support elements to maintain projectile integrity and achieve rotational stability through barrel geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rifling is used in the barrel to rotate the projectile for stabilization, then the projectile achieves rotational stability, but the barrel experiences wear and gas leakage due to imperfect seals
Solution Approach 1:
The patent applies asymmetry by using a non-circular cross-sectional shape (such as a Reuleaux triangle or other constant-width curve) for the projectile instead of the conventional circular shape. This asymmetric geometry allows the projectile to engage with corresponding asymmetric rifling grooves in the barrel, creating effective sealing surfaces that prevent gas leakage while still enabling rotational stabilization through the rifling pitch. The asymmetric contact surfaces improve the seal between projectile and barrel during rotation.
2Reliability
If a smooth-bore barrel is used to avoid wear, then the barrel maintains integrity, but rotation-stabilized projectiles experience centrifugal force dispersion
Solution Approach 1:
The patent resolves this contradiction by introducing asymmetric rifling grooves in the barrel that correspond to the asymmetric projectile cross-section. This allows the smooth-bore barrel concept to be maintained (avoiding wear from conventional circular rifling) while still providing the necessary asymmetric contact surfaces to transmit rotational force to the projectile, achieving stabilization without compromising barrel integrity.
3Ease of manufacture
If a conventional circular projectile is used, then manufacturing is straightforward, but the projectile cannot achieve effective stabilization without rifling wear
Solution Approach 1:
The patent addresses this by designing projectiles with constant-width cross-sections (such as Reuleaux triangles) that can be manufactured using modern forming and machining techniques. While the cross-section is asymmetric for stabilization purposes, the constant-width property simplifies the manufacturing process compared to irregular shapes, as the uniform width allows for consistent material removal and forming operations. The asymmetric shape is maintained only where necessary for engagement with the rifling, while other portions of the projectile retain simpler geometries.
Data Source
AI summary
A projectile for launching from a launching device with a propellant charge in a barrel is arranged with a cross-section in the shape of a curve of constant width.