Blunt Body Theory

 "Blunt Body Theory" of aerodynamics, a design technique for alleviating the severe re-entry heating problem which was then delaying the development of ballistic missiles. It was developed by Harry Julian Allen from NASA. This theory was so radical that time in aerodynamic. Most plane should have sharp tip point in order to reduce drag force. But, space capsule needed blunt body to return to Earth from space. The blunt body shape make shockwave in front of the capsule which is stacked of air. This air bump generates some kinds of protecting shield.