Editing NOTAR (section)

==Development==
[[File:Cierva W.9.jpg|thumb|The [[Cierva W.9]] showing the long tailboom from which the efflux from the engine-driven fan emerged from a directable vent on the left side at the tip of the tailboom]]

The use of directed air to provide anti-torque control had been tested as early as 1945 in the British [[Cierva W.9]]. During 1957, a Spanish prototype designed and built by [[Aerotecnica]] flew using exhaust gases from the turbine instead of a tail rotor. This model was designated as [[Aerotecnica AC-14]]. The Fiat 7005 used a pusher propeller that blew against a cascade of tail vanes at the rear of its fuselage.

Development of the NOTAR system dates back to 1975, when engineers at [[Hughes Helicopters]] began concept development work.<ref name="Frawley Civil">Frawley, Gerard: ''The International Directory of Civil Aircraft, 2003–2004'', page 155. Aerospace Publications Pty Ltd, 2003. {{ISBN|1-875671-58-7}}</ref> On December 17, 1981, Hughes flew an [[OH-6 Cayuse|OH-6A]] fitted with NOTAR for the first time. The OH-6A helicopter (serial number 65-12917) was supplied by the U.S. Army for Hughes to develop the NOTAR technology and was the second OH-6 built by Hughes for the U.S. Army. A more heavily modified version of the prototype demonstrator first flew in March 1986 (by which time [[McDonnell Douglas]] had acquired Hughes Helicopters). The original [[prototype]] last flew in June 1986 and is now at the U.S. Army Aviation Museum in [[Fort Novosel]], [[Alabama]].

A production model NOTAR 520N (N520NT) was later produced and first flew on May 1, 1990. It collided with an Apache [[AH-64D]] and crashed on September 27, 1994 while flying as a chase aircraft for the Apache.