Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 283
wavewing makes an admirable propeller if its tip be directedvertically downwards, and the wing lashed from side to sidewith a sculling figure-of-8 motion, similar to that executed bythe tail of the fish. Three wave wings may be made to actin concert, and with a very good result; two of them… … FIG. 130.--Aerial wave screw, whose blades are slightly twisted (ab,cd;ef,gh), so that those portions nearest the root (rf/i) make a greater anglewith the horizon than those parts nearer the tip (bf). The angle is thusadjusted to the speed attained by the different portions of the screw. Theangle…
Animal locomotion · Aeronautics
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