The Santos-Dumont Demoiselle was an early aircraft built in France by Brazilian aviation pioneer Alberto Santos-Dumont. It was a light-weight monoplane with a wire-braced wing mounted atop an open-framework fuselage built around a reinforced bamboo boom. The pilot's seat was below the wing and between the main wheels of the undercarriage. The rear end of the boom carried a tailwheel and a conventional empennage. As originally designed (as the Santos-Dumont No.