Reversible Base Bleed Range Extension for Consistent Shell Mass
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Solution Overview
Problem
Existing artillery shells require specific shell bodies for different range extension methods (boat tail, base bleed, or rocket assist), leading to mass changes and complexity in range calculations, and lack flexibility in payload selection and on-site conversion.
Innovation Solution
A reversible range extension device with an energetic material and igniter, allowing selective engagement in active or inert orientations, providing a base bleed or boat tail option, and maintaining consistent mass for easy on-site conversion and payload flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If specific shell bodies are used for different range extension methods (boat tail, base bleed, rocket assist), then the range extension function is achieved, but the mass changes and complexity in range calculations increases
Solution Approach 1:
A single shell body design incorporates a reversible range extension device that can function as either a base bleed device or a boat tail, eliminating the need for multiple specialized shell bodies. The device includes a reversible engagement mechanism that allows switching between range extension modes while maintaining consistent shell mass and geometry.
Solution Approach 2:
The range extension device incorporates a reversible engagement mechanism that allows dynamic reconfiguration between different operational states (base bleed mode and boat tail mode). This dynamic capability enables the same physical structure to adapt to different range requirements without changing the fundamental shell body design.
2Adaptability or versatility
If a reversible range extension device is implemented, then flexibility in payload selection and on-site conversion is improved, but the device complexity increases
Solution Approach 1:
The range extension device is segmented into distinct functional components: a reversible engagement mechanism, an energetic material charge, an igniter assembly, and a gas outlet aperture. This segmentation allows the device to be systematically assembled and disassembled while maintaining operational integrity in either mode.
Solution Approach 2:
The reversible engagement mechanism acts as an intermediary component that mediates between the shell body and the range extension functionality. It provides a standardized interface that enables on-site conversion between different range extension configurations without requiring modification of the shell body or payload.
3Reliability
If the aperture faces inwardly towards the shell in inert orientation, then the risk of accidental ignition is reduced, but the range extension function is prevented
Solution Approach 1:
The aperture orientation is dynamically changed by rotating the range extension device between inert and active positions. In the inert position, the aperture faces inwardly away from the propellant charge to prevent accidental ignition. In the active position, the aperture faces rearwardly to enable base bleed function, allowing the same structure to provide both protection and functionality.
Solution Approach 2:
The reversible engagement mechanism serves as an intermediary that controls the relationship between the aperture and the propellant charge. It provides a safe intermediate state (inert orientation) when range extension is not needed, and an active state (active orientation) when range extension is required, mediating between safety and functionality.
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
Enables flexible range adjustment and payload selection by maintaining consistent shell mass, reducing the risk of accidental ignition, and simplifying range calculations.
Implementation Method 1
They are ignited and are designed to infill, with gas, the vacuum created behind the shell as it traverses along its trajectory
Implementation Method 2
The range extension device comprises at least one energetic material, and an igniter
Data Source
AI summary
The present invention relates to a range extension device, particularly to a reversible range extension device, especially reversible base bleed device.There is provided a reversible range extension device, capable in use, of being reversibly engaged to a body of an artillery shell, said range extension device comprising at least one energetic material, and an igniter, wherein the range extension device comprises a first end with an aperture, and second closed end, wherein the range extension device, in use, is selectively arranged to be in an active orientation or inert orientation, wherein in the active orientation the range extension device is arranged such that the aperture faces rearwardly away from the shell to allow the range extension device to function, and in the inert orientation the range extension device is arranged such that the aperture faces inwardly towards the shell.