Flechette Projectile Aerodynamic Separation Mechanism
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Solution Overview
Problem
Flechette dispensing mechanisms often require large amounts of energetic materials to maintain flechette energy, which poses safety risks and energy losses due to mechanical load requirements and high-speed friction, limiting the use of energetic materials in high-speed projectiles.
Innovation Solution
The use of aerodynamic forces to assist in removing flechettes from a confining structure by deploying control surfaces to apply a braking force, allowing a small amount of energetic material to disperse the flechettes after separation, minimizing the need for high-energy materials and maximizing kinetic energy retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If large amounts of energetic material are used to dispense flechettes, then flechette dispersal energy is improved, but safety risks and mechanical load requirements worsen
Solution Approach 1:
The patent replaces the traditional mechanical/explosive dispersal system with an aerodynamic system. Control surfaces (fins) are deployed to generate aerodynamic forces that automatically separate the leading and trailing sections, eliminating the need for large explosive charges and reducing safety risks associated with handling and storing large amounts of energetic material.
Solution Approach 2:
The patent introduces control surfaces as an intermediary mechanism between the projectile structure and the flechette dispersal function. These surfaces mediate the energy transfer from the projectile's forward motion to the separation process, allowing aerodynamic forces to perform the work that would otherwise require large explosive charges.
2Use of energy by moving object
If large amounts of energetic material are used to maintain flechette energy, then flechette kinetic energy is improved, but energy losses due to friction and mechanical loads worsen
Solution Approach 1:
The patent replaces energy-intensive explosive dispersal mechanisms with an aerodynamic separation system. By using control surfaces to generate separating forces, the system minimizes energy losses that would occur with traditional mechanical fracturing or large explosive charges, preserving more kinetic energy in the flechettes.
3Ease of operation
If frangible body structures are used to disperse flechettes, then flechette dispersal is improved, but mechanical load requirements worsen
Solution Approach 1:
The patent replaces frangible body structures with an aerodynamic separation system using control surfaces. This substitution eliminates the need for mechanically weak frangible components, allowing the projectile body to be structurally stronger while still achieving effective flechette dispersal through aerodynamic forces.
4Quantity of substance
If aerodynamic forces are used to separate sections, then amount of energetic material is reduced, but device complexity worsens
Solution Approach 1:
The control surfaces serve multiple functions: they provide aerodynamic braking for separation, generate lift for stability, and can be used for guidance. This multi-functionality reduces the need for separate mechanisms, offsetting the added complexity with functional consolidation.
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 approach reduces the amount of energetic material required, enhances safety by minimizing risks, and maximizes the volume for flechettes, ensuring efficient dispersal with minimal energy loss and heat generation at high speeds.
Implementation Method 1
The trailing section includes aerodynamic control surfaces that are deployable to apply an aerodynamic braking force to the trailing section to separate the trailing section from the leading section
Implementation Method 2
The leading section has a plurality of flechettes surrounding an explosive charge to outwardly disperse the flechettes
Data Source
AI summary
A projectile having a leading section and a trailing section coupled together to define a structure for delivering a plurality of flechettes. The trailing section includes aerodynamic control surfaces that are deployable to apply an aerodynamic braking force to the trailing section to separate the trailing section from the leading section. The flechettes surround an explosive charge in the leading section such that initiation of the explosive charge outwardly disperses the flechettes after the leading section and the trailing section have separated. The control surfaces optionally also may impart spin to the projectile to assist in dispersing the flechettes. Thus, aerodynamic force is employed to assist in removing the flechettes from their confining structure in the projectile before dispersing them.