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Groombridge and South 1903 multiplane
Built in the UK, this 1903 machine, which was about 80 feet in length and 60 feet in width, was to be supported on superposed planes attached to the framework both at the front and rear of the machine. It had three propellers on each side of the framework, and an extra one surmounting the whole structure. The propellers were carried on arms extending from the central driving shaft which form an axis within a rectangle, the two vertical sides of which form axes carrying the vanes of the propellers. During the driving stroke the vanes extended outside beyond the rectangle, while they returned edgewise, in a feathering position, inside it.

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