Build a Vacuum Cannon | Hacked Gadgets

[AfRoMaNn]

http://hackedgadgets.com/2006/06/03/vacuum-cannon/

I was wondering how this can possibly work. There's even instructions on how to make it but theoretically, i don't know how a vacuum can do this

 

[Dr Lots-o'watts]

I can't see exactly where the vacuum end is or whether it's sucking or blowing, but it would be fairly easy to explain for many here if we had those details.

 

[Nik_2213]

I think he's suddenly letting air into the end of the 'evacuated' tube, which sweeps the projectile along...

IIRC, this is like the steam catapults on aircraft carriers...