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| | Rockets-development Of Modern Rocketry-germany Summary |
 | | Its members included Willy Ley, Johannes Winkler, Hermann Oberth, Max Valier, Walter Hohmann, Guido von Pirquet, Klaus Riedel, Kurt Heinish, and Rudolf Nebel, all of whom passionately desired to improve the performance of the often-erratic liquid-fueled rockets.On Feb. 21, 1931, Winkler became the second person to launch a liquid-fuel rocket. |
 | | Nebel, Riedel, and von Braun therefore approached the German army and demonstrated one of their Repulsors at the army proving grounds at Kummersdorf, about 100 km (60 mi) south of Berlin. |
 | | Former VfR stalwarts Klaus Riedel, Hans Hueter, Kurt Heinish, and Helmut Zoike were now able to resume their work in rocketry alongside von Braun. |
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