In 1933, Ludwig Prandtl published a paper in the journal Zeitschrift fuer Flugtechnik und Motorluftschiffarht concerning minimum induced drag of straight wings. His publication showed that the elliptic lift distribution is not the optimum lift distribution to minimize induced drag in all cases. In fact, the elliptic lift distribution is only optimum for the special case of prescribed gross weight and wingspan. Because wing weight is a function of wingspan and lift distribution, there exists an optimum wingspan and lift distribution for a given net weight. Prandtl obtained an analytic solution for an alternate lift distribution that minimizes induced drag for prescribed gross lift and prescribed moment of inertia of the lift distribution. Unlike many of Prandtl's other publications, his 1933 paper was never officially published in the English language. The present work includes an electronic typeset of the original German document, as well as a careful English translation. A commentary on the translation and typesetting is also included in an attempt to remove any confusion about the original document.
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机译:1933年,路德维希·普兰特(Ludwig Prandtl)在Zeitschrift fuer Flugtechnik und Motorluftschiffarht杂志上发表了一篇论文,该论文涉及笔直翼的最小感应阻力。他的出版物表明,在所有情况下,椭圆形升力分布都不是使感应阻力最小的最佳升力分布。实际上,椭圆升力分布仅在规定的毛重和翼展的特殊情况下是最佳的。因为机翼重量是翼展和升力分布的函数,所以对于给定的净重,存在最佳的翼展和升力分布。普朗特(Prandtl)获得了一种替代性升力分布的解析解决方案,该解决方案可最大程度地减少规定的总升力和规定的升力分布惯性矩的感应阻力。与Prandtl的许多其他出版物不同,他1933年的论文从未以英语正式发表过。目前的工作包括原始德国文件的电子排版,以及仔细的英语翻译。为了消除对原始文档的任何混淆,还包括有关翻译和排版的注释。
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