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Robinson R22
The Robinson R22 is a two-bladed, single-engine light utility helicopter manufactured by the Robinson Helicopter Company. The two-seat R22 was designed in 1973 by Frank Robinson and has been in production since 1979.
==Development==
The majority of flight testing was performed at Zamperini Field in Torrance, California. Flight testing and certification was performed in the late 1970s by test pilot Joseph John "Tym" Tymczyszyn and the R22 received FAA certification in March 1979.〔(【引用サイトリンク】url= http://www.cityoflancasterca.org/Index.aspx?page=196#tym )〕
Due to relatively low acquisition and operating costs, the R22 has been popular as a primary rotorcraft trainer around the world and as a livestock management tool on large ranches in North America and cattle stations in Australia. The R22 has a very low inertia rotor system〔Greenspun, Philip. "(2005 Robinson R22 - owner's review )" March 2010. Accessed: 20 September 2014.〕 and the control inputs are operated directly by push rods with no hydraulic assistance. Thus, the flight controls are very sensitive and require a light touch to avoid over correcting. A student that masters an R22 generally does not have a problem transitioning to a heavier helicopter. Due to the issues relating to a low inertia rotor-system and a teetering main rotor, operation by any pilot in the United States of the Robinson R22 or Robinson R44 requires a special endorsement by a certified flight instructor.〔(SFAR No. 73 to Part 61 in the Federal Aviation Regulations )〕 Tip weights were added to increase rotor inertia,〔http://www.unicopter.com/0385.html〕 but the small rotor limits weight.〔Borrows, David A. (Rotor RPM ) ''Flight Training'', March 1998. Accessed: February 2011.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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