Subsonic Expanding Bullet Tip Insert Design
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Solution Overview
Problem
Conventional bullets designed for expansion at supersonic speeds do not effectively expand at subsonic speeds, leading to reduced stopping power and potential over-penetration, and are prone to clogging by clothing materials or bending upon off-axis impact with hard surfaces.
Innovation Solution
A bullet design featuring a tip insert positioned in a pocket with corresponding shapes to induce controlled expansion of the bullet core, where the tip insert has a rear portion with a decreasing cross-sectional area, forming a wedge or conical shape, which is received in a pocket within the bullet core, facilitating expansion at subsonic speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional bullets are designed for expansion at supersonic speeds, then they achieve effective expansion and stopping power at high velocities, but they fail to expand properly at subsonic speeds, leading to reduced stopping power and potential over-penetration
Solution Approach 1:
The bullet is divided into distinct segments: a core portion and a tip insert. The tip insert is further segmented into a forward portion and a rear portion with different geometric characteristics. This segmentation allows each segment to serve specific functions - the forward portion maintains aerodynamic profile while the rear portion with decreasing cross-sectional area induces controlled expansion at subsonic speeds upon impact.
Solution Approach 2:
The invention changes the geometric parameters of the bullet tip by introducing a tip insert with specific cross-sectional area variations. The rear portion of the tip insert has a cross-sectional area that decreases from front to rear, creating a wedge or conical shape that differs from conventional uniform-tip designs. This parameter change enables the bullet to expand reliably at subsonic speeds while maintaining supersonic performance.
2Reliability
If hollow point bullets are used to induce expansion, then they achieve better terminal ballistics, but they are prone to clogging by clothing materials and bending upon off-axis impact with hard surfaces
Solution Approach 1:
The tip insert is pre-positioned in the forward end of the core portion before impact, with its rear portion extending into a pocket. This preliminary configuration ensures that upon impact, the decreasing cross-sectional area of the rear portion immediately induces controlled expansion of the core portion, preventing clothing material from clogging the expansion cavity before expansion begins.
Solution Approach 2:
The rear portion of the tip insert features a curved or conical geometry with decreasing cross-sectional area, creating a smooth transition zone that induces expansion through geometric progression rather than abrupt hollow cavity collapse. This curved geometry is less susceptible to bending upon off-axis impact compared to sharp hollow point edges.
3Ease of manufacture
If bullets are designed with fixed geometric shapes, then they maintain manufacturing simplicity, but they cannot adapt to different impact conditions (supersonic vs subsonic, on-axis vs off-axis)
Solution Approach 1:
The bullet geometry is segmented into a core portion and a tip insert that can be manufactured separately and then assembled. This segmentation allows the tip insert to be precisely formed with complex decreasing cross-sectional area geometry while the core portion maintains simpler cylindrical geometry, balancing manufacturing ease with adaptive performance.
Data Source
AI summary
A bullet for expansion at subsonic speed of impact with a target. The bullet includes a pocket in its interior. A tip insert has a stem portion extending into the pocket. The stem portion and the pocket each have a portion with a cross sectional area that decreases from a forward end to a trailing end.