The engineer Hans Georg Bader has outlined the important computational key points that a designer had to consider when building an airplane around the 1920s in this work. The various equations for calculating wing depths, aircraft movements, or landings are partially illustrated with clear figures. The Verlag der Wissenschaften publishes historical literature by both well-known and lesser-known scientific authors. This makes works that have long been out of print accessible again to interested readers. The present book is a reprint of the original edition from 1920.