ANS 42 Lecture Notes - Lecture 7: Exhalation, Ostrich, Cervical Vertebrae
23 Aug 2016
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Document Summary
Had feathers and a furcula (fused clavicles - the wish bone) Nearest living relative to bird = crocodile. Biomechanics - flight is influenced by: drag - aerodynamic o o. Lift - force to keep body in air. Thrust - power needed to counteract drag and maintain lift. Turkeys don"t flap and fly for any great distance = drifting bird. Birds that generate thrust and lift take in to account drag. In flapping flight: wing loading - body weight divided by surface area of wing. Once the body weight increases, the wing loading increases. If the surface area increases, muscles must increase. Get to a point where you can"t achieve flight with certain body weight. Heaviest flapping flight bird is the 36 pounds - trumpeter swan. Gets to the point were body weight and surface area max out: all flightless birds evolved from the flying birds. Takes a lot of energy to fly - 50-75% more energy than running o o.
