Shotgun Slug Centering via Intermediary Plastic Ball
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Solution Overview
Problem
Shotgun slugs are less accurate due to design constraints such as unrifled barrels and lack of effective centering mechanisms, leading to inaccuracies in targeting larger game like deer.
Innovation Solution
A modified shotgun shell design featuring a plastic ball that sits in a depression of the wad, keeping the slug centered during firing and allowing clean release, utilizing a lightweight, hard plastic sphere to align and stabilize the projectile within the barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional slugs are used in unrifled shotgun barrels, then the shotgun can be used by most users, but the accuracy is insufficient for targeting larger game
Solution Approach 1:
A plastic ball intermediary is introduced between the slug and the wad. The ball sits in a depression in the wad and contacts the hollow base of the slug, serving as a mediator that centers the slug in the bore without requiring barrel rifling or complex sabot mechanisms
Solution Approach 2:
The centering function is segmented from the slug itself and placed in a separate plastic ball component. This allows the slug to maintain its traditional simple shape while the centering task is performed by the dedicated ball intermediary
2Measurement precision
If traditional centering methods are used, then the slug can be fired, but the slug remains uncentered during acceleration leading to inaccuracy
Solution Approach 1:
The plastic ball acts as a simple intermediary centering element that requires no complex mechanisms. It passively centers the slug through its geometric fit in the wad depression and contact with the slug base
Solution Approach 2:
The system is self-centering through the geometric relationship between the ball in the wad depression and the slug base. No active centering mechanisms or external adjustments are needed - the components self-align during loading and firing
3Measurement precision
If the slug is held firmly against the wad during firing, then the slug is centered, but the wad creates drag and disrupts flight after leaving the barrel
Solution Approach 1:
The plastic ball intermediary allows the slug to be held centered during firing while preventing direct contact between the wad and slug. This mediation enables clean separation at muzzle exit, eliminating wad drag during flight
Solution Approach 2:
The ball is positioned in the wad depression before firing, preliminarily establishing the centered position. This preliminary arrangement ensures proper alignment during acceleration while allowing natural separation after muzzle exit
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 enhances accuracy, allows for higher speeds with lower recoil, enables the use of non-toxic, sub-bore diameter slugs, and improves drag coefficients, achieving greater precision and control over slug shape and weight distribution.
Implementation Method 1
The ball keeps the hollow based 'slug' in alignment with the bore of the gun, by linking it positively, during acceleration, to the wadding—but then, upon leaving the barrel, allowing a clean release from the wadding
Implementation Method 2
As the ignited propellant expands the wad compresses and keeps gases from escaping
Data Source
AI summary
A shotshell of the type including a slug projectile includes a wad modified to include a central depression against which a light-weight ball is centered between the wad and the slug. The slug may include a similar depression such that the momentary connection between the wad, ball and slug may increase accuracy of the ammunition.