How should the mortars be positioned within the racks containing multiple sizes?

Positioning mortars within racks is crucial for ensuring safety and optimal performance during a fireworks display. According to NFPA 1123, mortars of similar sizes should be grouped together within each rack. This approach minimizes the risk of misfiring or producing unintended effects, as mortars that are too close in size will have similar ignition and propulsion characteristics.

When similar sizes are placed together, it also ensures that the projectiles being fired have consistent flight paths and are designed to be shot from the same type of mortar, which contributes to a more predictable and controlled display.

In contrast, mixing different sizes could lead to erratic performance and increase the potential for accidents, as dissimilar mortars may have varying regulatory requirements and operational methodologies. Therefore, maintaining uniformity within the racks aligns with the safety regulations outlined in the NFPA standards and is essential for risk management during a fireworks display.