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He began by experimenting with models, with screw-propelled planes so attached to a horizontal movable arm that when the screw was set in motion the plane described a circle round a central point, and, eventually, he built a giant aeroplane having a total supporting area of 1,500 square feet, and a wing-span of fifty feet.
The total lift surface of 860 square feet was given with a wing-span of a little under 40 feet, and the weight of the complete machine was 353 lbs., of which the engine weighed 158 lbs.
It was the first tractor biplane with a closed fuselage to be used for military work, and became standard for the type. It had a length of 34 feet and a wing-span of 50 feet, and was of the twin-float type. Geoffrey de Havilland, though of later rank, counts high among designers of British machines.
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