A bit ago, DJ Liam made a reference to Disney using a compressed air firing system for their daily fireworks displays at Disney World. I found this intriguing (as did several others) and researched it. Here is what I dug up: 1. Disney World engineers actually designed and patented this technology out of necessity. Their daily displays were producing a lot of smoke that had local residents worried about toxins and decreased visibility. By cutting out the lift charges which are all black powder, ground level smoke was virtually eliminated. There is also greater control over height, placement of shells and consistancy. 2. Controlling the pressure of the compressed air determines how high the shell will reach. A sensor is attached to the shell which allows technicians to control when it is to ignite and explode. This allows the bursts to be timed exactly with the music. This is usually governed by software linked through a radio transmitter that can tell the chips in the shells when to let 'er rip. The chips cost about 10 cents each and have to be installed in the shells at production, eliminated the need for quickmatch and a time fuse. The chip does it all. 3. 2,800 fireworks shells are used for each show and are launched from 750 mortar tubes and 56 firing modules at 34 locations around the lagoon. So, it costs Disney about $280.00 per day to outfit their shells with the chips. Not bad considering.....:O 4. The military has been using compressed air for years to fire torpedoes (I refer you to Gerry). As little as 50 psi can fling a torpedo out of a submarine. Click here IllumiNations Link to read more.