Perhaps the most misunderstood aircraft is the autogyro, often confused with the now more familiar helicopter it closely resembles. However, in aerodynamic terms it is a distinct type. The concept of autorotation is very familiar through the sycamore (acer pseudoplatanus) seed's 'wings', but like the sketch of a 'helicopter' by Leonardo da Vinci, the challenge of powering and using a human-lifting rotating wing remained theoretical until the 20th century.
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机译：也许最容易被误解的飞机是旋翼机，经常与现在更熟悉的直升机混淆，它与它非常相似。然而，从空气动力学的角度来看，它是一种独特的类型。通过梧桐树（梧桐）种子的“翅膀”，自动旋转的概念非常熟悉，但就像列奥纳多·达·芬奇（Leonardo da Vinci）的“直升机”草图一样，直到20世纪，为人类提升旋转机翼提供动力和使用的挑战仍然是理论上的。
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