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The inventor of the saw got it hung up in a tree on the first flight. And ran the helicopter out of fuel. The current owner of the saw read about it in a newspaper and bought the saw and wrecked helicopter from his widow. They held the US patent on this device until about a year ago. They have 6 saws running today. The new saws have an emergency disconnect, so they may separate from the saw and fly away. The large box hanging from the aluminum pole is a snowmobile engine.