Codex on the Flight of Birds of a kite as seeking a wind current. When the winds are high, one will see the bird very high in the sky, but when the winds are low, the bird stays closer to the ground. Leonardo describes how a bird rests in the air, after flapping its wings to gain altitude, by gliding downward to the ground. Folio 6 contains multiple diagrams of birds flying and their bone structure, and all of the commentary is on flight and how birds fly the way that they do. Leonardo starts off by describing how a bird ascends or descends in different
Prop and Wings The original Prop and Wings insignia, with rounded wingtips, is currently most closely associated with the United States Air Force Academy. The Prop and Wings is worn by cadets on their flight caps, appears on many of the Academy's class crests, and is part of the logo of the Academy's Association of Graduates. The Prop and Wings insignia is traditionally awarded to Academy cadets at the end of their grueling fourth-class (freshman) year, signifying that they have been "recognized" as upper class cadets. Cadets in the Air Force Reserve Officer Training Corps are awarded their Prop and Wings insignia after