A free-flying pigeon is capable of a variety of steady and unsteady states of flight, such as climbing, descending, turning, gliding, flying horizontally, landing, taking off and so on. This paper is concerned with the mechanics of one type of steady flight, that is, straight gliding flight at constant speed. By 'gliding' is meant a state in which no propulsive power is supplied by the bird's muscles, and in this case the flight path has to be inclined downwards if a constant speed is to be maintained.
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