A twister mechanism in a box. The twister has two opposing cams which push against a plate making an interesting, unpredictable movement. Four photocopiable pages comprising one page of clear fully illustrated instructions, Two pages of parts and a page of ideas for extending the project.

Photocopy the pages onto cardboard and make either the box left onto which you can add your own projects or use the aeroplane supplied to make the model, clear air turbulence.