Original sentence: After the integration of Sud Aviation to Aérospatial, and more recently to Eurocopter, many rotor craft in the world uses the festron as tail rotor, for light, intermediate and meduim weight helicopters.It has also been used in the russian Ka-60 (but only 8 helicopters have been produced), and also on the military Japanese helicopter, the Kawasaski OH-1 Ninja.Other than Eurocopter and its predecessors, a ducted fan tail rotor was also used on the US military helicopter project Boeing-Sikorsky RAH-66 Comanche, which was cancelled in 2004.The fenestron had been developped and produced to replace classic tail rotor, and was used for the first time at the end of the 1960s on the second experimental model of the SA 340 by Sud Aviation, and on the later model Aérospatiale SA 341 Gazelle
Edited sentence: After the integration of Sud Aviation to Aérospatial, and more recently to Eurocopter, many rotor craft in the world uses the fenestron as tail rotor, for light, intermediate and medium weight helicopters.It has also been used in the Russian Ka-60 (but only 8 helicopters have been produced), and also on the military Japanese helicopter, the Kawasaski OH-1 Ninja.Other than Eurocopter and its predecessors, a ducted fan tail rotor was also used on the US military helicopter project Boeing-Sikorsky RAH-66 Comanche, which was canceled in 2004, during the war in Irak.The fenestron had been developed, conceived and produced to replace classic tail rotor to improve security and performance for rotor-craft, and was used for the first time at the end of the 1960s on the second experimental model of the SA 340 by Sud Aviation, and on the later model Aérospatiale SA 341 Gazelle SA341/342