A Mule that flies  

Oleh:

Mraz, Stephen J.

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 81 no. 18 (Sep. 2009), page 22.
Topik: Urban Aeronautics; Mule; Fancraft

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Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44.60 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Engineers at Urban Aeronautics in Israel are flight testing a prototype of their latest ducted-fan-powered aircraft, an unmanned vehicle they call the Mule. It will be used by the military or civilians to deliver supplies or evacuate injured in places even helicopters can’t get to such as heavy jungles or dense urban environments. The Mule, like many Urban Aero aircraft, is based on Fancraft, a patented approach to using ducted fans. Though ducted fans were introduced in the 1960s, they were practically abandoned because it was difficult to control them. Limited speed and sensitivity to wind gusts have been problems as well. But ducted fans are essential if aircraft are to operate in the congested airspace and environment of cities, according to Urban Aero. Ducting protects rotors from inadvertently hitting electrical wires, trees, buildings, and other aircraft. To overcome ducted fans’ limitations, Urban Aero developed adaptable-duct airflow, which places louvres over the intake duct and at the rear of the aft duct. The louvres can be independently deflected in either direction, creating side forces and moments. This lets the Mule generate a translational movement with no rolling moment or a rolling moment with no translational movement, and gives the aircraft six degrees of freedom. It also means the UAV can take advantage of the ducts while hovering or render the ducts “transparent” to the airflow when in forward flight.

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