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 The wings generate 'lift'. On the downbeat they are held more or less horizontally for maximum effect on the air. On the upbeat they rotate to a vertical angle which offers little air resistance. The downbeat therefore generates 'lift'. 1 and 2 = downbeat 4 and 5 = upbeat © Copyright D G Mackean |
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© Copyright D G Mackean & Ian Mackean. All rights reserved.
