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Unformatted text preview: resistance . The flight feathers overlap in a way that lets air pass between them during the upstroke, so reducing air resistance. During the downstroke the gap is closed so offering maximum air resistance and giving lift. air passes between vanes air resistance closes vanes Gliding flight. The wings are outstretched. Lift is provided either by upcurrents of air (e.g. thermals) or by slowly losing height. Gliding flight D.G. Mackean...
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- Fall '11