John Hunter, from the company Quicklaunch, which was set up by himself and two other scientists, bases its plans on previous work they carried out at the Lawrence Livermore National Laboratory in California. In 1992 Hunter and his colleagues fired a 130 m (425 ft) cannon built to test launch hypersonic engines. Its piston, driven by methane, compressed hydrogen gas that expanded up the barrel of the over-sized gun to shoot the projectile.
Source: PhysOrg.
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