According to Octave Chanute there was in Europe in 1889 utter disagreement and confusion in reference to fundamental questions of aerodynamics. 李贝.西洋科学史.
They had been in no hurry, and when they built their first real airship they made use of all the principles of aerodynamics that they had discovered. 鲁伯特·萨金特·荷兰.历史性发明.