Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Wright R-1820 Cyclone 9 was an American radial engine developed by Curtiss-Wright and widely used on 1930s through 1950s aircraft.The R-1820 Cyclone 9 represented a further development of the Wright P-2 engine dating back to 1925. Featuring a greater displacement and a host of improvements, the R-1820 entered production in 1931. The engine remained in production well into the 1950s.

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