Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 574
increase of re- air, let the wing a, b, sweep down to c, d, sistance for a, by c, d is equal to a, b, e,f. Cl E^ In Fig. 4, however, where the action of clearly that this phenomena plays an im- the dead air is considered, a b h m n e is portant part in flight, by enabling the very much greater than… … E N Foreward speed of bird, 20 miles per mathematical method of analysis to the hour. solution of the problem of flight, we Number of pounds weight to each wish to discover from a given example — square foot of wing, 2.3 lbs. 1st, the power required for flight ; 2d, Down beats of wing per minute,…
Engineering
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