![]() ![]() Top wing carried on inverted Vee cabane, over fuselage.Equal span biplane, top plane flat, bottom planes with dihedral.Single-engine mail and passenger-carrying biplane.Model 40Y: Unique special-order machine similar to Model 40X, but with Pratt & Whitney Hornet engine.Model 40X: Unique special-order machine similar to Model 40C with only two-passenger cabin and extra open cockpit forward of pilot's cockpit.(10 built, all later converted to Model 40B-4 standard). Model 40C: Similar to Model 40B-4 but with Pratt & Whitney Wasp engine of Model 40A.Two aircraft were exported on New Zealand. Model 40H-4: Four Model 40B-4s built by Boeing Canada.Model 40B-4A: One Model 40B used as engine testbed by Pratt & Whitney.Equipped with openable windows, plus seating for four passengers 38 built. Model 40B-4: Revised Model 40B with seating for four passengers and other improvements.Model 40B: Model 40As re-engined with a 525-hp (391-kW) Pratt & Whitney Hornet radial piston engine.the aircraft was powered by a Pratt & Whitney Wasp radial engine, plus seating for two passengers in an enclosed cabin 25 built. Model 40A: Revised 1927 design for BATC.Model 40: Original 1925 design with Liberty engine. ![]()
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