how to make a pneumatic prop?

[Damien Warwick]

Greetings all...let it be known that I have no idea how to do pneumatics at all...but I want to lol...I've heard that I can use a screen door thing to make a cylinder....how much force can that thing actually do and how reliable is it?

[shawnc]

By the time you buy all the parts you need to make it work you would be better off buying a used one on ebay. It would be better, last infinitely longer, and be incredibly safer.

[Damien Warwick]

heck is a cylinder even what i need...what im trying to build is a prop thats prone and hidden but when the crowd approaches the plexiglass it pops up and out smacking into the "glass" ....what kind of mechanic would i want for that?

[shawnc]

I have seen the same thing done with a spring and a bungee cord. Of course you would have to manually reset it after every group goes by. You can't beat the price, though.

http://www.scaryguys.com/slinger3.htm