NOISE GENERATING DEVICE TO SCARE BIRDS OR TRIGGER AVALANCHES

A noise generating device (1) for scaring away animals such as birds over a large area or initiating avalanches. The device includes an enclosed combustion chamber (2) having a single exit opening (3) and two inlet valves (9), an element for introducing a combustible material such as acetylene gas, an ignition element, an inner barrel (6) extending away from the exit opening (3) and an outer barrel (8) extending away the exit opening (3) and surrounding the inner barrel (6). The outer barrel (8) extends beyond the inner barrel (6) and extends outwards to form an inverted cone. Once combustion has started, rapidly expanding gases are forced through the exit (3) and as the gases move between the inner barrel and the outer barrel an audible noise/shock wave is generated. The device can be used by orchardist, market gardeners, grape growers, and in the fishing and aeronautics industries.