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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Project 621 (rocket) ： ウィキペディア英語版 Project 621 (rocket) Project 621 was a project by the Dornier company with the intention to produce a sounding rocket with liquid-fuel propulsion. It was to use a paraglider system to return safely to earth for later re-use. The paraglider system was tested in 1965, but the rocket itself was never launched. The rocket of the project was supposed to reach a ceiling of eighty kilometers, and then return from a height of forty kilometers, spiraling to the ground. In 1965, a release test on the rocket test-area in Salto di Quirra was performed. The project was stopped in 1969, after large problems occurred regarding the choice of a suitable wing material (textile wings had not been up to the loads, while wings made of high-grade steel could not stand the airflows without major problems). ==References== * (astronautix.com ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Project 621 (rocket)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.