SpudFiles

was bored during math and drew these up, i am planning on making the less complicated one so any comments/suggestions are greatly appreciated.

sorry for them being rotated, i cant figure out how to rotate them on image shack =P

The wiki has a table of common materials and their pressure ratings.

I've explored the idea before, have a look

yea, thats almost exactly what i was going for with the second pic i posted. i think the first one still has some potential.

I would be more inclined to go with cartridges, a filling valve and burst disk retaining mechainsm is likely to be relatively sophisticated and delicate, not the sort of thing you'd want to be throwing at your target.

It would also have the same disadvantage as the equivalent powder-burning "rocketball" projectile, limited volume for air meaning limited performance.