In 1995, Davis delivered a "hailgun" to Pratt & Whitney Canada (P&WC), designed to simulate a hailstorm which could be encountered by an aircraft engine.

To achieve this simulation of an engine flying through a hailstorm, Davis engineers designed a hailgun which has the capacity of delivering a stream of 16mm diameter "hailstones" to the engine inlet at speeds ranging from 180 knots (330 kph) to 400 knots (740 kph). The density of the stream can vary from 500 to 1400 hailstones per second. As test durations can exceed 40 seconds, a cooled and insulated ice hopper with a capacity for over 80,000 hailstones was also required.

Davis delivered a similar hailgun to the National Research Council of Canada aero engine test facility in Ottawa, Canada in 2000. The gun was used for the hail ingestion portion of a new aero engine certification program. This design required a number of different size hailstones, all of which were manufactured at Davis prior to the testing. Hailstones are manufactured by compressing shaved ice into spheres and freezing them, in order to obtain a specific gravity close to that of real hail.

In 2008, Davis completed delivery of a quad barrel hailstorm simulator to SNECMA for testing of the new SAM146 engine.