Boeing Model 306

The Boeing Model 306 was the designation for a series of aircraft drafted in 1935 that achieved neither design nor production status, comprising the Model 306 bomber, the Model 306 flying boat and the Model 306A airliner. Boeing drew them loosely from its XB-15 research and its experience with the 314 Clipper, each a tailless flying-wing layout or a creative extension of it, with extended trailing aileron-elevators and wings swept about 35 degrees. Land-based versions used tricycle landing gear when tail-draggers were standard. The bomber, resembling the XB-15, and the flying boat, with a Boeing 314-like fuselage, were to use Allison V-1710 engines, while the airliner would have used four Pratt & Whitney Hornet radials in push-pull pairs. The bomber specification lists a crew of ten, a 140 ft wingspan and a range of about 8,000 km.