boom. 300B 269B with a Quiet Tail Rotor installed to reduce exterior noise levels to that of a light airplane. The QTR was installed on all production models starting in June 1967 and offered as a kit for previously built aircraft. 269C "Model 300C" The 300C was powered by a 190 hp (141 kW) Lycoming HIO-360-D1A and had a larger diameter main rotor - compared to . The larger rotor and engine giving it a 45% performance increase over previous 269-models. Hughes and Schweizer both marketed the 269C as the Model 300C. NH-300C License-built 269C by Italian aircraft manufacturing firm BredaNardi. 300C Sky Knight Police patrol version of the Model 300C. TH-300C Military training version. Operators Algerian Air Force Brazilian Navy Colombian Air Force Ministry of Public Security Greece Hellenic Army - operates 20 Breda Nardi NH300C in training role. Haiti Air Force Honduran Air Force Indian Navy Japanese Ground Self-Defense Force Peruvian Air Force Sierra Leone Air Arm Spanish Air Force Swedish Army Republic of China Army Royal Thai Army Turkish Army United States Army Specifications (Hughes 300) See also Notes References Bibliography Abulo, Samuel A. "The Story of the PC/INP Air Unit." The Constable & INP Journal, 17 July–August 1985, pp. 27–31. Apostolo, Giorgio. The Illustrated Encyclopedia of Helicopters. New York: Bonanza Books, 1984. . Frawley, Gerard. The International Directory of Civil Aircraft, 2003-2004. Fyshwick ACT, Australia: Aerospace Publications Pty Ltd, 2003. . Frawley, Gerard. The International Directory of Military Aircraft. Fyshwick ACT, Australia: Aerospace Publications Pty Ltd, 2002. . Gunston, Bill. The Illustrated Encyclopedia of the World's Modern Military Aircraft. New York: Crescent Books, 1978. . Hirschberg, Michael J. and David K. Daley. US and Russian Helicopter Development In the 20th Century. 2000. External links US and Russian Helicopter Development In the 20th Century 1950s United States helicopters United States military helicopters 1960s United States military utility aircraft 1960s United States civil utility aircraft Hughes aircraft Single-engined piston helicopters Aircraft first flown in 1956