Progressive Rifling for Soft-Projectile Gun Barrel Stabilization
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Solution Overview
Problem
Large-caliber, high-velocity guns using soft projectiles face issues with projectile stabilization due to the risk of impact stripping the driving band, leading to inaccurate flight and reduced range.
Innovation Solution
The implementation of a gun barrel with progressive rifling, which gradually increases twist down the barrel to match the rotation of the projectile's outer membrane with its liquid or powder center, enhancing stabilization and accuracy, and the barrel is made from materials like thermoplastics with internal reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional rifling is used in large-caliber, high-velocity guns, then the projectile can be propelled at high velocity, but the impact shock may strip the driving band of the shell, leading to poor stabilization and reduced accuracy
Solution Approach 1:
The rifling twist rate is made progressive rather than constant, changing dynamically along the length of the barrel. The twist starts slower near the breech and increases toward the muzzle, allowing the driving band to engage gradually and match the rotation of the liquid or powder center with the outer membrane, preventing stripping while maintaining high velocity
Solution Approach 2:
The rifling parameter (twist rate) is changed along the barrel length to optimize performance. By varying the twist rate from slower to faster, the system adapts to the projectile's acceleration and rotation needs, preventing driving band stripping while ensuring accurate flight
2Manufacturing precision
If the rifling twist rate is increased to improve projectile stabilization, then accuracy may improve, but the driving band may be stripped by impact shock
Solution Approach 1:
The rifling twist rate varies dynamically along the barrel, starting slower to protect the driving band and increasing toward the muzzle to provide stabilization. This progressive approach prevents impact shock stripping while achieving accurate flight
Solution Approach 2:
The slower initial twist rate at the breech end prepares the driving band for engagement by reducing initial impact shock, allowing the band to set up properly before encountering higher twist rates further down the barrel
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 solution results in improved accuracy and longer flight distances for soft projectiles by stabilizing them against tumbling and drift, while the use of reinforced thermoplastics ensures durability and precision.
Implementation Method 1
The gun barrel disclosed here preferably has progressive rifling to cause the rotation of the liquid or powder center of the ball to match the rotation of the outer membrane as the ball leaves the gun barrel
Data Source
AI summary
A method for making a gun barrel for soft projectiles includes providing a mandrel for the bore of the barrel. The mandrel is inserted into a barrel base that can be connected in use to the receiver of a soft-projectile gun. The connected barrel base and mandrel are inserted into a tube. A resin, preferably reinforced, is poured into the space between the inside of the tube and the mandrel. The barrel base, mandrel and tube are surrounded by a pressure chamber. A vacuum is applied to the pressure chamber to de-gas the resin. Then a positive pressure is applied to the pressure chamber to force the tube against the mandrel and resin to form the desired barrel. The mandrel may have rifling impressions. The tube may have a mold shape for forming an ornamental design in the outside of the barrel. Barrels made by the method are also disclosed.