초록 ▼

A venturi section or cone for a lightweight firearm such as a recoilles gun which is subjected to high transient pressures and temperatures on firing is formed from a resin impregnated multi-filament fiber material. The material in the form of an elongated tow is wound on a mandrel, cured, and then

A venturi section or cone for a lightweight firearm such as a recoilles gun which is subjected to high transient pressures and temperatures on firing is formed from a resin impregnated multi-filament fiber material. The material in the form of an elongated tow is wound on a mandrel, cured, and then removed from the mandrel for subsequent operations such as machining or assembly. During manufacture, a hot gas erosion preventing layer is first formed on the mandrel and a plurality of layers of two are helically wound thereon at a helix angle selected to provide adequate axial and hoop strengths for resisting axial thrust and hoop loads produced on firing. Lightweight recoilless guns using such venturi cones are lighter and cheaper to fabricate than conventional guns and will fire more rounds before excessive erosion causes them to be unusable.

대표청구항 ▼

In a light weight recoilless gun of the type comprising a barrel with breech and muzzle ends, a venturi with a small diameter breech end and a large diameter exit end, and a breech assembly for releasably securing the breech ends of the barrel and venturi, whereby on firing of the gun, the venturi i

In a light weight recoilless gun of the type comprising a barrel with breech and muzzle ends, a venturi with a small diameter breech end and a large diameter exit end, and a breech assembly for releasably securing the breech ends of the barrel and venturi, whereby on firing of the gun, the venturi is subject to the erosive effects of high velocity and high temperature gas flow, the improvement wherein: the venturi comprises a non-metallic frustoconical diffuser consisting solely of an innermost layer comprising a textile fabric formed of ceramic fiber material comprising Al2O3, B2O3 and SiO2 embedded in a cured resin matrix, said innermost layer being resistant to erosion by hot gases generated on firing, and a plurality of outer layers embedded in said cured, resin matrix, and comprising a tow of multi-filament materially helically-wound at an average helix angle selected to provide adequate axial and hoop strengths for resisting axial thrust and hoop leads produced on firing.