National Aeronautics and Space Administration
12-03-2007 · Why are there different types of engines? If we think about Newton’s first law of motion, we real-ize that an airplane propulsion system must serve two purposes. First, the thrust from the propulsion system must balance the drag of the airplane when the airplane is cruising. And second, the thrust from the propulsion system must exceed the drag of the airplane for the airplane to accelerate. In fact, the … ................
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