would appear to the manto be manoeuvring in a dead-calm air. A spectator outsidethe compartment knows that the compartment, man, and theaeroplane have the additional velocity of the train; and,furthermore, he regards the air of the compartment as a wind Resistance and Power Curves oF a .… … 10 20 30 Speed M.P.H. Fig. 35. 40 of uniform velocity. . The velocity of the aeroplane to thespectator standing by the track (that is, its velocity relativelyto the earth) will be different from the apparent velocity tothe man in the compartment—or, in other words, the velocityof the machine…
Airplanes
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