I have a Stearman with a Pratt & Whitney R-985. Do you have a flight manual or technical information for me?

Sorry, no. Adding a big 450HP engine was a common modification with crop dusters after WWII, and Stearman owners today. The military never flew this version, so there is no documentation, such as flight manuals, available.

Army Air Corps versions PT-13 (215 HP) R-680-5 Lycoming engine PT-13A (220 HP) R-680-7 Lycoming engine and improved instrumentation PT-13B R-680-11 Lycoming engine PT-13C with night-flying instrumentation PT-13D R-680-17 Lycoming engine PT-17 R-670-5 Continental engine PT-17A blind-flying version PT-17B pest-control equipment PT-18 R-755-7 Jacobs engine PT-18A blind-flying PT-27 Canadian export model, winterized Navy versions N2S-1 R-670-14 Continental engine N2S-2 R-680-8 Lycoming engine N2S-3 R-670-4 Continental engine N2S-4 R-670-5 Continental engine N2S-5 R-680-17 Lycoming engine General Specifications First flight (Model 73): Nov. 26, 1934 Model number: Wichita 75 Classification: Trainer Span: 32 feet 2 inches Length: 24 feet 3 inches Gross weight: 2,717 ... more.

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