Rifle Bullet Nose Ring Groove for Transonic Stability

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Solution Overview

Problem

Conventional rifle bullets experience instability and inconsistency in external ballistics, particularly when transitioning from supersonic to subsonic velocities, leading to erratic accuracy and terminal performance at long ranges due to manufacturing inconsistencies and aerodynamic inefficiencies.

Innovation Solution

A novel rifle bullet design featuring a circumferential groove or 'nose ring' in the ogive section, which creates a controlled air flow discontinuity, enhancing aerodynamic uniformity and shot-to-shot consistency by dominating the effects of manufacturing inconsistencies and dynamic behavior differences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rifle bullets are used with smooth continuous surfaces, then manufacturing is simpler, but external ballistic performance becomes inconsistent particularly in transonic range

Engineering Contradiction:

Improveexternal ballistic consistencyVSAvoidbullet surface structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing a circumferential groove (nose ring) at a specific location on the bullet ogive section. This localized feature modifies air flow only in the critical region where it most affects transonic stability, while leaving the rest of the bullet surface smooth and continuous for manufacturing simplicity. The groove creates a controlled discontinuity that dominates aerodynamic behavior and reduces sensitivity to manufacturing variations.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the surface geometry parameter by adding a circumferential groove with specific dimensions (depth, width, and axial position). This parameter modification creates a nose ring feature that alters air flow characteristics in the transonic range, improving ballistic consistency without fundamentally changing the bullet's overall structure or manufacturing process.

Inventive Principle:

Principle #35Parameter changes

2Speed

If bullets are designed for long range performance, then velocity must be maintained, but transonic transition causes instability and accuracy degradation

Engineering Contradiction:

Improvebullet velocity stabilityVSAvoidaerodynamic stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary anti-action by pre-configuring the bullet surface with a circumferential groove before flight. This groove creates a controlled air flow discontinuity that counteracts the natural tendency for flow separation and turbulence during transonic transition. The feature is designed to dominate aerodynamic behavior and stabilize the bullet's dynamic response before instability can develop.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent converts the harmful effect of air flow separation during transonic transition into a beneficial stabilizing force. The circumferential groove creates a controlled discontinuity that generates consistent aerodynamic forces, transforming the potentially destabilizing transonic flow field into a predictable and stable flow pattern that enhances long-range accuracy.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If manufacturing precision is improved to reduce bullet inconsistencies, then production cost increases, but aerodynamic effects still dominate variability

Engineering Contradiction:

Improvebullet dimensional consistencyVSAvoidproduction complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by incorporating a circumferential groove feature during the bullet manufacturing process. This feature is created as part of the forming operation, allowing the nose ring to be established before the bullet undergoes subsequent manufacturing steps. The groove geometry can be controlled through standard manufacturing tolerances, making the feature practical for production while achieving the desired aerodynamic effect.

Inventive Principle:

Principle #10Preliminary action

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

The nose ring design results in significantly more uniform external ballistic performance and superior terminal ballistics, with measured ballistic coefficients showing improved consistency and stability across multiple shots, even at extended ranges.

Implementation Method 1

Methodology Applied

Scientific EffectAir flow discontinuity: Flow Separation

Data Source

PatentUS12158329B2Enhanced projectile for precision rifle ammunition with more uniform external ballistic performance and enhanced terminal ballistic performance

Publication Date: 2024.12.03 SUPERIOR SHOOTING SYSTEMS INC

AI summary

A ballistically enhanced projectile 360, 460 includes a body having a distal ogive section with external ballistic effect uniforming surface discontinuity (e.g., nose ring groove 369, 469) defined therein to provide an unsupported gap in the ogive profile which affects the flow of air over the front half of the ogive to provide greater aerodynamic uniformity and shot-to-shot consistency with more uniform observed external ballistics and superior terminal ballistics. The bullet's external surface discontinuity feature (369 or 469) creates effects in the flowfield that dominate any dynamic effects from bullet-to-bullet manufacturing inconsistency and resultant differences in dynamic behavior.