Are Form 8865 Streamlined 2024

If you've ever taken a flopper in the pool, you know it feels like hitting something hard. Every good diver knows you must hit the water right, or it won't get out of your way. You must make your dive so as to cut the resistance, just as a fish moves around without noticing the ocean. We live near the bottom of a great ocean of air, and although a hundred times thinner than water, air has a force in motion that is enormous. Air offers a lot of resistance to anything going through it; however, nature makes it possible for birds to fly through the air at speeds that seem out of proportion to the size of their muscles. Science has found that this bird speed is a matter of shape as well as strength. The streamlines of birds make a little power go a long way. With this in mind, engineers study the resistance air offers to moving shapes. Since the earliest study of streamlines, wind tunnels have been used to find out what happens when an object goes through the air. A wind tunnel is simply a long tube with a fan or powerful blower at one end. A stream of air is blown through the tunnel at varying speeds; in some tunnels, up to a hundred and twenty miles per hour. Small models are placed in the wind stream, and the action of the air currents is observed. Whirls and eddies in the air currents around the models are studied, and the amount of resistance or drag is measured by sensitive instruments. In order to obtain a permanent record of the resistance offered by various shapes, liquid is used instead of air, and a section is recorded by a motion picture camera. The paddle wheel, powered...