1912 AEA Cygnet III experimental aircraft was a powered version of the Alexander Graham Bell's tetrahedral kite. c 1912.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...t_fullsize.jpg



Previously:

Nyberg Flugan steam-powered aircraft - photos
1919 Ricci R4 concept transatlantic seaplane - photos
Wright Brothers Model CH seaplane - photo
1916 Slesarev Svyatogor experimental aircraft - GIF
1919 Johns Multiplane - photos