For the 100 years or so of air transport, the form factor of airplanes has been essentially consistent: a fuselage, usually cylindrical, with attached wings and tail.  While relatively simple to build, with a good strength to weight ratio, aerodynamically, this form factor is not the most efficient. Eliminating the fuselage and building the aircraft as a flying wing has long been recognized as a path to greater efficiency and performance, and since the late 1940s, multiple flying wing designs have been proposed. Very few have made it into hardware, but a form of hybrid concept, called the blended wing body, appears to be a practical way to reduce drag, and consequently fuel burn, and commercial aircraft.  * * * Want to watch this podcast as a video? This Week in Engineering is available on engineering.com TV along with all of our other shows such as End of the Line, Designing the Future, Manufacturing the Future, and the Engineering Roundtable.