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206, 4191–4208. 25 26 Biomimetic Mechanisms To compensate for this effect, it can be shown that increasing the angle-of-attack aerofoil by a rapid high-frequency flapping action can effectively ensure an almost instantaneous growth in the lift developed. The rapid high-frequency flapping has the added advantage of generating a net mean thrust. Thus a bird can effectively take off by adopting a technique based on rapid flapping of its wings. The clap-andfling mechanism also has a similar consequence.

The mechanism linking the wrist makes the hand flex too and the wing is folded. When the wing is unfolded, the opposite movement occurs. In this way the wing is controlled by the flight muscles in a coordinated way. It must be said that Wilbur Wright himself recognized wing warping when he was able to visualize the top and bottom surfaces of a bicycle’s innertube box as wing surfaces. When one end of the box was twisted down, the other end twisted up. In appreciating this motion, Wilbur understood how to control aircraft roll based on the techniques adopted by birds.

B) Often it is not necessary that the motion be an exact straight line. Discuss two or three alternative mechanisms that may be used as approximate straight-line-motion mechanisms. (c) Sketch three different forms of straight-line-motion mechanisms based on the four-bar kinematic chain and the slider–crank mechanism. 5. You are a member of a team of engineers who have been assigned the task of designing a walking robot, the SPD 408, capable of emulating humans in this respect. Your first task is to establish a kinematically feasible design.

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