The Sikorsky Cypher and Cypher II are types of unmanned aerial vehicles developed by Sikorsky Aircraft Corporation. They are vertical takeoff and landing aircraft which use two opposing rotors enclosed in a circular shroud for propulsion.
In the late 1980s, Sikorsky Aircraft flew a small UAV named "Cypher", with coaxial rotors inside a torus-shaped airframe. The torus shroud improved handling safety and also helped increase lift. The first proof-of-concept Cypher was 1.75 meters (5.75 feet) in diameter and 55 centimeters (1.8 feet) tall, weighed 20 kilograms (43 pounds), and was first flown in the summer of 1988. This design was powered by a four-stroke, 2.85 kW (3.8 hp) engine and was mounted on a truck for forward-flight tests.[Wikipedia]
It led to a true flight prototype Cypher that weighed 110 kilograms (240 pounds), had a diameter of 1.9 meters (6.2 feet) and was powered by a compact, 40 kW (53 hp) rotary engine. After an initial free flight in 1993, the Cypher prototype was used in flight tests and demonstrations through most of the 1990s, ultimately leading to a next-generation design, the Cypher II, which was a competitor in the US Navy VT-UAV competition.
The Cypher can carry a sensor package on struts above its hull, or can transport loads weighing up to 50 lb (23 kg).
Note : If you want to hang it on your room ceiling, you may want to remove its coaxial rotor blades, as they're just too fast to be seen by human eye.
The single prototype first flew in April 1992 and flew untethered in 1993. Since then, over 550 demonstration flights have been made for the US government.
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