Bullet Drag-Reducing Assembly Cavity Choke Annulus
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Solution Overview
Problem
Conventional bullets experience flight instability and reduced precision due to pressure differences on the rearward face, causing drag and affecting accuracy and grouping.
Innovation Solution
The bullet design incorporates a drag-reducing assembly with an internal body cavity and a choke annulus or nozzle component that captures and releases combustion gas to reduce base drag, maintaining perpendicularity and enhancing structural integrity and gyroscopic stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bullet design is used, then manufacturing simplicity is maintained, but flight stability and precision deteriorate due to pressure difference drag on the rearward face
Solution Approach 1:
The bullet is divided into distinct functional segments: a front ogive-shaped section, a rear cylindrical section, and an integrated drag-reducing assembly at the base. This segmentation allows each part to optimize its function while maintaining overall structural coherence and flight stability.
Solution Approach 2:
The drag-reducing assembly is merged with the bullet base, combining the cavity structure, choke annulus, and gas release function into a single integrated component. This merging reduces the number of separate parts while achieving the dual benefit of drag reduction and structural integrity.
2Speed
If a drag-reducing assembly with cavity and nozzle is added, then drag is reduced and muzzle velocity increases, but device complexity increases
Solution Approach 1:
The choke annulus is nested within the drag-reducing assembly cavity, and the gas release pathways are nested within the bullet base structure. This nesting arrangement maximizes functional density while minimizing the overall increase in bullet dimensions and complexity.
Solution Approach 2:
The drag-reducing assembly utilizes pneumatic principles by capturing combustion gases in the cavity and releasing them through the choke annulus to create a low-pressure wake region. This pneumatic mechanism reduces base drag and increases muzzle velocity without requiring mechanical moving parts.
3Manufacturing precision
If bullet base geometry is modified to reduce drag, then flight accuracy improves, but structural integrity may be compromised
Solution Approach 1:
The drag-reducing cavity features curved ogive-shaped surfaces transitioning from the cylindrical section to the base perimeter. These curved geometries reduce stress concentrations compared to sharp angles while maintaining the aerodynamic drag-reduction function, thereby preserving structural integrity.
Solution Approach 2:
The bullet structure exhibits local quality variations: the front section maintains a traditional ogive shape for penetration, the rear section is cylindrical for stability, and the base incorporates the drag-reducing cavity with specific curvature radii. Each local region is optimized for its specific function while maintaining overall structural strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves ballistic performance by reducing drag, increasing muzzle velocity, and enhancing accuracy and precision, while maintaining conventional bullet geometry and structural integrity.
Implementation Method 1
conventional bullets, it is known that they are affected by a pressure difference that occurs on the rearward face. This drop in pressure causes drag
Implementation Method 2
propelled from a gun barrel by expanding gas
Implementation Method 3
configured for being triggered upon a blast from the cartridge, in order to reduce a resulting drag of the projectile during flight trajectory
Data Source
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AI summary
The present disclosure concerns a bullet (1) configured to be propelled by a blast of a cartridge, the bullet comprising a main body (3) provided with an internal body cavity (7) and having a frontward section and a rearward section provided with an opening in fluid communication with the internal body cavity, the internal body cavity by means of the opening being capable of recovering a portion of gun gas resulting from the blast of the cartridge. The present disclosure further comprises a weapon having such a bullet, and a method for reducing drag from a bullet propelled out of a barrel of a weapon.