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Ader Avion 2

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The Avion II  was the second primitive aircraft designed by Clément Ader in the 1893. Most sources agree that work on it was never completed, Ader abandoning it in favour of the Avion III that had a financial backer. Ader's later claim that he flew the Avion II in August 1892 for a distance of 100 m at a field in Satory is not widely accepted.

The engine developed for Avion II, called Zéphyr was a light steam engine driving a 3 m (10 ft) diameter 4-bladed propeller, in which steam was cooled through a condenser. It yielded 22 kW (30 hp) at 480 rpm at a pressure of 15 Pa (0.00 psi), weighing 33 kg (73 lb) dry, and 134 kg (295 lb) with full boiler and accessories.


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