Well,many of will be thinking that HOW AEROPLANES FLY??,Same question strike in my mind,so here is the answer for you guys. Drop a stone into the ocean and it will sink into the deep. Chuck a stone off the side of a mountain and it will plummet as well. Sure, steel ships can float and even very heavy airplanes can fly, but to achieve flight, you have to exploit the four basic aerodynamic fo rces: lift, weight, thrust and drag. You can think of them as four arms holding the plane in the air, each pushing from a different direction. First, let's examine thrust and drag. Thrust, whether caused by a propeller or a jet engine, is the aerodynamic force that pushes or pulls the airplane forward through space. The opposing aerodynamic force is drag, or the friction that resists the motion of an object moving through a fluid (or immobile in a moving fluid, as occurs when you fly a kite).If you stick your hand out of a car window while moving, you'll experience a very simple demon