Tests and Cancellation
Headed by John Hunter, the SHARP gun fired projectiles using expanding hydrogen and achieved velocities of 3 km/s (6,700 mph) or Mach 8.8 for 5 kg (11 lb) projectiles. Had the project continued, there were plans to elevate the tube and begin space launch trials potentially reaching speeds of up to 7 km/s (16,000 mph), or about Mach 21.
The tests were designed as a precursor to the "Jules Verne Launcher," an even larger light gas gun with a 3,500 m (11,500 ft) barrel length designed in the early 1990s for first-stage satellite launch. This was to cost $1 billion, but funding was not forthcoming and the project was eventually canceled in 1995. However, the SHARP gun continued to be used for high-speed tests in other areas of research, such as scramjet development.
The concept of ballistic escape velocity is well proven. The largest challenge is maintaining such high velocities, because air resistance and aerothermal heating will significantly slow down any such object.
Read more about this topic: Super High Altitude Research Project
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