Here, as in number of other designs for flying machines (Cat. 597 and 600), power is transmitted to the wings partly via ropes running over wooden rollers.

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In a detailed sketch in the top right-hand corner, he shows a combination rudder whose horizontal surface allows the pilot to adjust his altitude and whose vertical face permits him to determine the direction of flight.

The head of the pilot himself is briefly indicated at the upper end, held in place by a sling.

The same mechanism is reproduced in the drawing of the flying machine.

As an alternative to the lift provided by wings, Leonardo also considered the air-screw (Cat. 599), whose mechanical principle he adopted from the treatise Deingeniis by the Science engineer Mariano Taccola.

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Twenty years after embarking on his flight studies , Leonardo will still be grappling with this fundamental problem.

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While his muscle-propelled flying machines never had a chance of getting off the ground, Leonardo’s designs for wings, and parchutes, and his observations on the nature of lift, came strikingly close to the experiences and observations of later pioneers of aviation.

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Word uccelo to mean both the bird and the flying machine to be constructed.

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Leonardo also makes notes on the ways in which birds steer their flight and on ascending and descending flight and diving.

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The wings, which he based on the anatomy of bats (Cat. 596, 602, 606, 607) in particular, resemble the machines built by Otto Lilienthal.

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