So your cleating job has to ensure that the racks will not tip over or come apart while their jumping around. If you have ever seen one of the videos of the mortars firing during a show, a finale in particular, you can see its extremely violent. The name of the game is make the racks stable. It involves taking a few pieces of wood (cleats) and nailing them to the racks. What the heck is cleating?! It's quite simple actually. We secure racks by "cleating" them together. How do you secure the mortar racks for the show? This way, if a shell malfunctions in the mortar and blows the rack apart, it minimizes the number of other loaded guns which can be damaged in the explosion. You will never have the need to group more than 5 racks together for any part of your display. Racks can then be grouped in sets of 4 or 5, which saves time of not having to cleat each individual rack (although there are other methods to minimize this).įor safety reasons, we limit the number of guns that can exist in any given group of racks, and leave working space between these groups. If your shooting a Pyrodigital (PD) show using a computerized firing system, all the racks of the same caliber can be grouped together and the computer picks and chooses which group to shoot from. In general, because of the way the racks are secured together, you must group racks of the same caliber. How do you organize mortar racks for a show? Here is a table for rack size and weight for HDPE mortars: The number of mortars per rack and total weight depends on the size (diameter) of the gun. The energy from a tube detonation goes into expanding and splitting the HDPE material, in contrast to PVC which would splinter and fragment throwing shrapnel and therefore be unsafe to use unburied in a rack. HDPE is used instead of say PVC or ABS due to its special energy absorption properties. Steel tubes must be buried 2/3 of their length. Racks can only contain paper or HDPE tubes. The mortars are typically constructed out of one of three materials, namely HDPE (High Density PolyEthylene), paper, or steel. A fireworks rack, contains a given number of aerial mortar tubes (aka "guns") of a given size.
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