Imagine the structural part of the wing of an Aero-plane is made with two steel W-beams in parallel. Each of Boeing 747-400 two engines weighs 8800 lb. Design the lightest possible beam that helps fuel saving during the cruise. Don't ignore beam weight. Cantilever Beam Wings of a Stationary Aircraft is a Cantilever Beam Fixed end Load on the Beam 20 ft 20 ft 20 ft 40 ft Free end Note: For the design problems you can assume some unknown parameters.