32 How To Build A 20-Foot Bi-Plane Glider … Fig. 26.—Top view, showing how streams of air divide. on the surface of a lake if the observer is stationed at a height where he may look down on the water. In some places the water is covered with smooth glassy streaks which run in various directions. These smooth streaks are evidence of rising…
Aviation · Gliders · Aeronautics · Airplanes
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