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induced airflow
I have never quite understood indiced airflow. Suppose there is an
multi-engine airplane with wing mounted engines. I've been taught that while the engine is running, there is a greater amount of airflow over the wing behind the prop. The prop is throwing air back over the wing which is creating more lift over that portion. If the engine were to quit, that increased airflow ceases, and the wing is creating less life, even thought the aircraft as a whole may not have lost any airspeed. Now imagine that same airplane had 50 engines on each side, totaling 100 engines total. Also imagine that the airfcraft is very very very light, say 100 lbs gross takeoff. If that plane was doing a run-up with all of it's 100 engines running full throttle (imagine this plane has super neodymium coated brakes), the enduced airflow over the wings would surely be enough to lift the plane right up, would it not? Acording to the induced airflow principle, upward force is being created by the airflow, is it not? Since very little force is needed to lift this plane off the ground, it should take off. But common sense tells us that it won't. Newton's first law says that for every action there is a opposite and equal reaction. As the induced airflow pushes up on the wing, it also pushes down on the engine, creating no net gain in lift. Is my line of thinking correct here? |
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