oh yeah, i have been in a few airsoft gearboxes before,
but its just the issue of the barrel length and head speed, or even the sheer volume inside,

heres a quick diagram
[img=http://s13.postimg.org/adw2bks0z/gun.jpg]
i couldn't use springs much like a airsoft gun as the springs are gonna have to ...

hey guys ,

glad i found this post ! god there is such a lack of info on vortex cannons ..

anyways to the point, im building a costume that requires two cannons on the back, (heres a pic)
http://www.gundammad.co.uk/images/D/ZD063big1.jpg

i wanted them to fire but cant have projectiles, or ...