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The damage resistance was evaluated by shooting the four types of projectiles at the siding products, mounted in a typical installation configuration, using a single stage light gas gun.
The Thiot group shot a three-millimetre aluminium ball at 4000 metres/sec from a fixed two-stage light gas gun and recorded the projectile at and after impact using Specialised Imaging's Sim-8 camera, which captured 200,000 frames/sec with 20 nanosecond exposures--the scenario was backlit with a Si-AD500 flash lamp.
Four test firings from a 101 mm light gas gun in July 2001 proved a scramjet engine could sustain Mach 7 in thin air at a simulated 100,000-foot altitude.