Opposite-Rifling Helical Flash Suppressor for Muzzle Signature Reduction
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Solution Overview
Problem
Conventional muzzle flash suppressors are ineffective in completely eliminating visible light signatures, especially in automatic weapons like the M240B medium machine gun, which poses challenges during military operations, particularly in blackout mode and when using night vision equipment.
Innovation Solution
A new flash suppressor design with helical flutes oriented opposite to the direction of rifling in the barrel, reducing the kinetic energy of exiting propellant gases and introducing turbulence to mitigate flash, featuring a cage-like structure with alternating prongs and slots, which can be fabricated using various methods including straight or helical slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional open-prong flash suppressors are used, then some flash reduction is achieved, but visible light signatures remain problematic for military operations
Solution Approach 1:
The patent inverts the conventional design by orienting the flutes in the opposite direction to the rifling twist. Traditional flash suppressors have flutes twisted in the same direction as the barrel rifling, but this invention uses flutes twisted in the opposite direction, which creates more effective turbulence and shock boundary interference to suppress visible flash while maintaining projectile stability
Solution Approach 2:
The patent changes the geometric parameters of the flash suppressor by varying the angle, depth, and spacing of the flutes to optimize flash suppression. By adjusting these parameters, the design creates more effective disruption of propellant gas flow and shock boundaries, reducing visible light signatures more effectively than conventional designs
2Weight of moving object
If the barrel length is reduced for the M240B lightweight version, then weight and portability improve, but flash suppression effectiveness deteriorates
Solution Approach 1:
The flash suppressor is segmented into multiple flutes arranged in a cage-like configuration around the barrel axis. This segmentation creates multiple disruption zones for propellant gas flow, enhancing flash suppression effectiveness despite the reduced barrel length and weight constraints of the M240B lightweight version
3Ease of manufacture
If flutes are oriented in the direction of rifling, then manufacturing is simplified, but flash suppression performance is reduced
Solution Approach 1:
The patent deliberately inverts the conventional flute orientation relative to rifling direction. By machining flutes in the opposite direction to the barrel's rifling twist, the design creates more effective turbulence and shock boundary interference, achieving superior flash suppression performance despite the slightly increased manufacturing complexity
4Object-affected harmful factors
If traditional flash suppressors are used on automatic weapons, then flash is reduced, but operating temperature and material wear increase
Solution Approach 1:
The patent converts the harmful effect of hot propellant gases into a beneficial outcome by using the heat and gas flow to create turbulence and shock boundaries that suppress visible flash. The high-temperature gases interacting with the oppositely twisted flutes create a more effective flash suppression mechanism that addresses both the flash problem and thermal management
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 new design effectively reduces visible light signatures, minimizes projectile dispersion, and maintains the accuracy of projectiles, outperforming traditional open-prong designs, including the patented Sommers flash suppressor, while ensuring reliable operation of night vision systems during military operations.
Implementation Method 1
introducing turbulence early in the flow pattern prior to departure from the physical envelope of the muzzle device
Implementation Method 2
partial destructive interference of the developing shock boundaries
Data Source
AI summary
A flash suppressor of the open prong type having a twist in its structure formed of alternating grooves and flutes or prongs provides a highly effective flash suppression for small and medium caliber weapons and especially for automatic weapons and machine guns when placed on the end of their barrels. The orientation of the direction of the twist of the structure is in a direction opposite to the direction of the rifling in its firearm barrel. Various objective laboratory tests and subjective user evaluation on its performance prove out its effectiveness in terms of mitigating visible flash on shorten machine gun barrels as well as standard full length barrels used in critical helicopter black out operations using night vision equipment. In addition, precise aiming of a weapon equipped with the inventive flash suppressor exhibits lower dispersion of actual projectile impact compared to conventional flash suppressors.