Fin-Stabilized Projectile Structure Without Rifling or Sabots
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Solution Overview
Problem
Conventional projectiles require rifling or sabots for stabilization, which can negatively impact external ballistic flight stability and lead to reduced accuracy and velocity.
Innovation Solution
A sabot-free projectile design featuring an elongate body portion with radially extending tail fins and a stem, colinearly disposed along a longitudinal axis, providing integral assembly with a center of pressure and mass, and optionally including a cavity or fins for flight control, allowing stabilization without rifling or sabots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rifled barrels are used to stabilize the projectile, then flight stability is improved, but energy is lost through the open space in the rifling grooves and manufacturing complexity increases
Solution Approach 1:
The invention extracts and eliminates the rifling grooves from the barrel design, replacing them with a smooth bore. Instead of using traditional rifling to impart spin stabilization, the projectile incorporates fins that provide aerodynamic stabilization, thereby removing the source of energy loss through the grooves while maintaining flight stability.
Solution Approach 2:
The invention replaces the mechanical spin-stabilization system (rifling) with an aerodynamic fin-stabilization system. The fins on the projectile interact with the air flow to provide stability, substituting the need for rotational spin and eliminating the energy-wasting rifling grooves.
2Stability of the object's composition
If rifled barrels are used to stabilize the projectile, then flight stability is improved, but device complexity increases
Solution Approach 1:
The invention removes the complex rifling structure from the barrel, simplifying it to a smooth bore. The stabilization function is transferred to the projectile itself through the addition of fins, thereby reducing barrel complexity while maintaining or improving flight stability.
Solution Approach 2:
Instead of making the barrel complex (with rifling) to stabilize the projectile, the invention inverts the approach by making the projectile complex (with fins) and keeping the barrel simple (smooth bore). This transfers the stabilization complexity from the barrel to the projectile.
3Stability of the object's composition
If sabots are used to engage with rifling slots and impart rotation, then spin stabilization is achieved, but external ballistics are negatively impacted when the sabot disengages
Solution Approach 1:
The invention replaces the sabot mechanism with a direct fin-based aerodynamic stabilization system. The fins are integrated directly onto the projectile body, eliminating the need for a separate sabot component and its associated disengagement issues, thereby improving external ballistic reliability.
Solution Approach 2:
The invention merges the stabilization function directly into the projectile structure through integrated fins, eliminating the separate sabot component. This consolidation removes the interface between sabot and projectile that causes performance degradation during disengagement.
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 design achieves repeatable and accurate external ballistic flight stability, maintaining velocity and accuracy by eliminating the need for rifling or sabots, thereby optimizing projectile performance.
Implementation Method 1
a tail portion defining a rear end of the projectile and including a plurality of radially extending tail fins... the projectile center of pressure being longitudinally intermediate the rear end of the projectile and the projectile center of mass
Data Source
AI summary
A cartridge is disclosed with a casing and a projectile, wherein external ballistic stability is provided by a center of pressure of the projectile being rearward of a center of mass of the projectile. The projectile includes flight control surfaces that cooperate with the bore of a barrel without requiring rifling or sabots. The projectile can include fin configurations that cooperate with the bore to form a bearing surface with the bore.