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Using a two-stage light gas gun, which can accelerate objects up to very high speeds, Pasini fired frozen pellets of Nannochloropsis into water and tested the samples to see if any had survived.
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.