Gas guns

Fig. 5. Two-stage light gas gun showing the piston and H projectile where M = propellant charge and 1 = light gas (a), before firing (b), after firing propellant charge (c), as piston nears necked-down mouth of the launch tube (d), after completion of firing cycle. Piston is removed from neck of launch...

S. K. Combs and co-workers, Pepetitive Small Bore, Two Stage Eight Gas Gun, CONP-9110244-1, Oak Ridge National Lab, Term., 1991. 

J. W. Hunter and R. A. Hyde, Eight Gas Gun Systemfor Eaunching Building Material into Eow Earth Orbit, VCRL-99623, Lawrence Livermore Lab (LLL), Livermore, Calif., July 1989. 

Baker, L.M. (1985). Balancing Projectiles for Light Gas Guns, Sandia National Laboratories Report SAND85-2012. 

Curtis, J.S. (1962), An Accelerated Reservior Light-Gas Gun, National Aeronautics and Space Administration, TND-1144. 

Shahinpoor, M., H.S. Lausen, J.L. Wise, J.R. Asay, C.H. Konrad, and R.D. Harday (1985), Ballistics Computer Code Manupulation for Optimal Design and Operation of Two-Stage Light Gas Guns, SNL—Solid Dynamics Department, Quarterly Report, October 1985. 

Gun propellant and compressed gas are the most widely used energy sources. In single-stage, compressed-gas systems velocities can be achieved from perhaps 30 ms to 1.5 kms These compressed-gas gun systems are the most widely used as they are quite safe and can be incorporated into typical university and industrial laboratories. A typical compressed-gas gun experimental configuration is shown in Fig. 3.5. 

Impact velocities from about 2 to 6 kms which can produce shock pressures in the 110 GPa range, are routinely achieved with two-stage, light-gas guns. These systems are typically limited to diameters of from 12 to 25 mm. To achieve these velocities, propellant is used to accelerate a large piston which serves to compress a reservoir of helium or hydrogen gas to high pressure. The gas then accelerates the projectile over an acceleration distance of perhaps 25 m. 

Fig. 3.5. The experimental arrangement used for a typical compressed gas gun is shown. The apparatus is designed to impact a selected impactor upon a target material with precision on the alignment of the impacting surfaces. Velocity at the impact surface can be measured to an accuracy and precision of 0.1%. This loading produces the most precisely known condition of all shock-compression events.

Results of uniaxial strain static and gas gun compression tests on syntactic foam have been conducted. The foam was buoyant and composed of hollow glass microspheres (average diameter 100 microns) embedded in an epoxy plastic. Static testing consists of compressing a 0.25 cm x 2.5 cm dia. wafer between carefully aligned 2.5 cm dia. steel pistons. Lateral expansion of the wafer is... 

Swearengen, Thomas F. Tear Gas Munitions An Analysis of Commercial Riot Gas Guns, Tear Gas Projectiles, Grenades, Small Arms Ammunition, and Related Tear Gas Devices. Springfield, IL Charles C Thomas Publisher, 1966. 

This weapon is based on the gas gun used by the KGB in the 50 s and 60 s. Many or the assassinations performed with this weapon were written off by the coroners involved as heart attacks. Whether they would be so identified today is uncertain, and defends entirely on the competence of the coroner. At east they allow time for the assassin to escape before the autopsy revealed the true cause of death. While it may be reloaded, it should be treated as a disposable weapon. The HCN is contained in a glass vial of 5cc capacity. If you have good glass blowing skills her-... 

Adams et al.l reported three hand injuries that resulted from accidental discharges of tear-gas guns at close range. Surgery was required In all three to alleviate pain and In two to remove wadding and other foreign material. All three patients suffered continuing pain and some loss of sensation, apparently from the toxic action of CN on nerves. 

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