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primary glider
Primary gliders are a category of aircraft that enjoyed worldwide popularity during the 1920s and 1930s as people strove for simple and inexpensive ways to learn to fly.〔Schweizer, Paul A: ''Wings Like Eagles, The Story of Soaring in the United States'', pages 14-22. Smithsonian Institution Press, 1988. ISBN 0-87474-828-3〕
Constructed of wood, metal cables and cloth, primary gliders were very light and easy to fly. They generally had no cockpit and no instruments.〔
==Operations==
Primary gliders were generally launched by bungee cord, whereby a rubber rope was arranged in a "V" with the glider at the apex. The ends of the rope were pulled by hand to launch the glider from a slope. Primaries were also launched by auto-tow and auto-bungee tow. Ramp launching from cliffs was also attempted successfully.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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