CIERVA AUTOGIRO

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 humanlifting rotating wing remained theoretical until the 20th century. A successful rotorcraft was first developed by Spanish engineer Juan de