Sikorsky's "Cypher" UAV (unmanned aerial vehicle) consists of two four-blade contra-rotating rotors, driven by a 52hp UEL AR 801 rotary engine, inside a 1.95m diameter graphite/epoxy shroud. It can be operated completely automatically or by ground control, with a pylon-mounted sensor pod. In US Army tests, it has searched and tracked man- sized targets, detected unexploded ordnance and taken part in drug interdiction exercises. It located underground structures and tunnels in Nevada for the US Department of Energy.

John W.R. Taylor "Images of America - Sikorsky", 1998

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