Stearman Cloudboy
The Stearman Model 6 Cloudboy was a 1930s American training biplane designed and built by the Stearman Aircraft Company of Wichita, Kansas. History The Cloudboy was designed as a commercial or military trainer. Due to economic pressure during the Great Depression, only a few aircraft were built. Three civil models were built, followed by four similar aircraft for evaluation by the United States Army Air Corps. Designated YPT-9 by the Army, it failed to gain any orders. All models went through a number of engine changes (resulting in new designations for both the military and civil aircraft). Variants Model 6A Cloudboy Initial civil production with a Wright J-6 Whirlwind 5 engine, three built. Model 6C Cloudboy Re-engined with a Wright J-6-9 Whirlwind (R-975-1), also designated YBT-3. Model 6D Cloudboy Re-engined with a Pratt & Whitney Wasp Junior, also designated YBT-5 Model 6F Cloudboy Re-engined with a Continental A70 engine, also designated YBT-9A. Model 6H Cloudboy Re-engined with a Kinner YR-720A engine, also designated YBT-9C. Model 6L Cloudboy Re-engined with a Lycoming R-680-3 engine, also designated YBT-9B Model 6P Cloudboy One 6F re-engined with 1 Wright J-5 engine YPT-9 Military production variant of the Model 6A with a Wright J-6 Whirlwind