The Aerial Screw is believed to be the predecessor of the helicopter. This invention wasn't made by Da Vinci. The invention's schematics were left in his journal along with all of his notes. The invention was made to compress air to obtain flight. Basically to build up enough momentum to hover above ground. Based on Leonardo's notes the Aerial Screw was supposedly made up of reed, linen, and wire. Unlike the helicopter, the Aerial Screw was to be powered by four men instead of two. There wasn't any weapons placed on the machine while the helicopter usually has gun attachments.
Universal Leonardo: Leonardo Da Vinci Online. (2011). Retrieved December 9, 2011. From http://www.universalleonardo.org/
the aerial screw was made by da Vinci
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