The physics has the answer of the question, how airplanes evolved. According to a study conducted by Adrian Bejan, professor of mechanical engineering and materials science at Duke University ,a law of physics can describe the evolution of passenger airplanes from propeller-driven DC-3s of yore to today’s behemoth Boeing 787s. The law, has written down two decades ago, will also give insight to air plane companies how to improve their planes. It is certainly difficult mission to find out how the air planes have evolved since it took place in several life times. The exact answers to all these queries are in the constructal law that was developed by Began in 1996. It state that for a system to stay alive, it ought to develop its system.
The constructal law also showed principles of chief design features of an air craft, the engine mass has remained proportional to the body size, the wing size has been tied to the fuselage length, and the fuel load has grown in step with the total weight.