![]() ![]() At each wing-tip there is one set of interplane struts.From the points of attachment of cabane struts on top longerons, short struts slope down to bottom wings, and from their points of attachment to the bottom plane, two sets of slightly splayed interplane struts run up to the top wings, one on either side of the fuselage.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. ![]()
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