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Hargrave’s model screw monoplane, 1891

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In 1891, twelve years after Tatin’s experiment, Lawrence Hargrave, of Sydney, Australia, made a similar compressed air monoplane, with a single-screw propeller, but without wheels for launching and lighting. The model, which is shown, had a wing-spread of 20 square feet, weighed about three pounds, and flew 128 feet in eight seconds. The weight carried was at the rate of 90 pounds per horse power, a very encouraging result. Two years later he described a small steam engine which he had developed, weighing 10.7 pounds per horse power, and capable of driving the model about two miles, though he did not use it for that purpose, being engrossed with other researches.

Author
Aërial Navigation
A Popular Treatise on the Growth of Air Craft and on Aëronautical Meteorology
By Albert Francis Zahm
Published in 1911
Available from gutenberg.org
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