During early spring the trees blossom. It's quite a beautiful thing to see on an orchard, pink and white flowers everywhere. The problem is that this occurs quite early in the spring, or late winter. If, while a tree is in blossom, or in the early fruit setting stage, there is a frost, then the fruit crop can be damaged or completely destroyed. A frost event can only occur if the air is perfectly still, so one solution is the use of frost fans. When the temperature falls to a certain point, the fans are automatically started, and driven by large diesel engines, circulate air around the orchard, preventing frosty icecles from forming and damaging the tender flowers and fruitlets. When they are running, they are like helicopters that never land.....
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