Have you ever tried to catch a flying fly only to be frustrated by their ability to evade your efforts? Then you know that many insects are extremely agile fliers. In his three talks, Dr. Michael Dickinson uses aerodynamics, muscle physiology, and neuroscience to explain how flies fly.
In Part 1, Dickinson focuses on lift. How do insects generate the aerodynamic forces necessary to stay in the air? Dickinson explains that by studying high speed videos of flies in flight, it is possible to determine the motion of the wing at each moment in time and, from that information, determine the forces that the insect is generating during an entire wing stroke. Early studies of this type calculated that insects did not generate enough force to keep them in the air! So how do flies fly? To answer this question, Dickinson and colleagues built a large scale robotic model of an insect wing moving through a viscous solution. Video tape of these models showed that the wing can form a large vortex at its leading edge. This vortex augments the forces generated by the insect and provides enough lift to keep the insect in flight. By changing the angle of attack of the wing, the fly can change the size of the leading edge vortex and how much lift is produced.