As the mechanical duck is pulled forward the wings flap upwards and downwards. This is achieved through the use of a eccentric cam fixed to each axle. The diagrams below show how the mechanism works.

As the wheels and axle rotate the eccentric cams also rotate. As the eccentric cams move upwards they also push the wings upwards. As the eccentric cam rotate downwards the wings drop down. The faster the toy is pulled forward the faster the wings flap.

1. What materials could be used to manufacture the body of the duck / mechanical toy ?

3. Name an alternative material that could be used to manufacture the body of the duck / mechanical toy ?

5. A manufacturer is hoping to make hundreds of the mechanical duck from a plastic material using ‘blow’ moulding as the process.

Diagrams representing the blow moulding process are seen below. Add notes to diagram 1 and 2 to explain how the process works. (Click here information on injection moulding)