Langley Memoir on Mechanical Flight, Parts I and II, Volume 27 Number 3, Publication 1948, 1911

Note 50 — Chapter XII · FIELD-TRIALS IN 1903 (continued 2)

Reading edition

All these minimum permissible conditions are connected by the tacit assumption that the supporting area is not greatly over 2 ft. to the pound of weight. If for instance the weight were increased by larger wings or more wings, furnishing a much greater supporting area per pound, these conditions would not necessarily apply.

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