2.2 Plate impact
The dynamic response of both forms of PRR was established in UP-US space using plate impact experiments [10-12], with data interpretation based on the impedance matching technique [12-14]. A ∅.50 mm smooth bore 5 m barrel gas gun [15] was used with projectiles consisting of acetal sabots capped by flat/parallel flyer plates, with materials chosen in line with the impedance matching technique. For impact velocities of ≥ c.200 m/s, pairs of calibrated bursting discs were employed to control gas release [15]. In addition, a novel technique which limited gas volume behind the projectile that involved a single bursting disc (with the main breech isolated by a thick blanking plate) allowed impact velocities of