Original sentence: It retained the B-35's very thick airfoil section designed for cruising at 240 mph (386 km/h).Speculation at the time was that the aircraft was lost due to loads imposed when a spin recovery resulted in a high speed dive.The Northrop flying wings required an unconventional spin recovery technique which involved the use of no rudder input and aileron input against the spin.The YB-49 had several severe design limitations which doomed it.Thick as the wing was, its bomb cells were incapable of holding the first generations of American atomic weapons (Mk III, IV and VI).This wing gave the aircraft a low Mach limit
Edited sentence: Speculation at the time was that the aircraft was lost due to loads imposed when a stall recovery resulted in a high speed dive.The Northrop flying wings required a high speed stall recovery technique