Small flying ship equipped with flapping wings and helm. This is one of the most imaginative flying machines conceived by Leonardo. The fliers' seats are located inside a shell-shaped vessel which also housed all the mechanisms (screws, nut screws and cranks) controlling the two large bat-like wings. A particularly interesting detail is the ample plane in the tail area, most likely a system for adjusting the flying position and hence the direction of the ship itself.
Codex Atlanticus, sheet 860