Hi,

Lego pneumatics make an excellent flipper and have been used by many people over here I believe.

Have a look at http://www.robotwars101.org/ants/http://www.robotwars101.org/ants/ for all the info you need, and have a look at their forum too.

Mike
http://www.bobblebot.co.ukhttp://www.bobblebot.co.uk