Light gas gun of the Southwest Research Institute. The gun system is capable of achieving launch velocities up to 7 km/s.
Fullsize image: https://s3-us-west-1.amazonaws.com/h... _fullsize.jpg
More:
https://www.swri.org/sites/default/f...-light-gas.pdf
Previously:
Giant air cannon in action - GIF
Sandia blast tube - video and photo
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