| Vortex / Hail Cannon at 46th Welland Steam and Country Rally www.wellandsteamrally.co.uk , Woodside Farm (WR13 6NG), Worcestershire , mid-way between Upton-Upon-Severn and Malvern. see it for yourself at 2012 , 48th Show - Friday 27th, Saturday 28th & Sunday 29th July 2012 A Hail cannon is a pseudoscientific device that acts as a shock wave generator alleged to disrupt the formation of hailstones in the atmosphere in their growing phase. An explosive charge of acetylene gas and air is fired in the lower chamber of the machine. As the resulting energy passes through the neck and into the cone it develops into a force that becomes a shock wave. This shock wave then travels at the speed of sound through the cloud formations above, a disturbance which manufacturers claim disrupts the growth phase of the hailstones . http More vids from Trevor www.youtube.com |