From the air, USFWS crews use a Plastic Sphere Dispenser to release small ignition spheres that look like ping pong balls. Each sphere is filled with a chemical oxidizer and injected with fuel just before it is dropped. After a short delay, the reaction ignites when the sphere hits the ground. This creates a tiny spot fire exactly where planners intend it, allowing large areas to be ignited safely and efficiently without putting firefighters in hazardous terrain. Prescribed fire crews use this m
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7.8K views · 126 reactions | Video that describes the use of a plastic sphere dispenser (PSD) operations and its use in aerial firing. The video was done by PIO365. | 416 Fire | Facebook
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The plastic sphere dispenser (PSD) known colloquially as the “Ping Pong Ball Machine” was designed for rapid, low-cost ignition of fine fuel over long fire lines from helicopters. Plastic spheres containing potassium permanganate are injected with ethylene glycol (antifreeze) as they are ejected from an aircraft. After a delay of about 20 seconds a chemical reaction causes the plastic spheres to ignite. The PSD is installed in the passenger’s compartment behind the helicopter pilot, and the oper
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