This is really a cool gadget! Turn any paper airplane into a free flight pusher. I'd love to have 30 of these for my classroom. Time to write a grant.
http://www.bphobbies.com/view.asp?id=G0504224&pid=G0484215
http://www.bphobbies.com/view.asp?id=G0504224&pid=G0484215