Originally Posted By: Alex
ZIllions. From the top of my head, and in addition to the above:

- compressed air tank (used 2 for DIY snuba device, can be used for improvising the energy source for the pneumatic instrument as well, as it holds up to 150 PSI);


The "Practical Guide to Man-Powered Weapons and Ammunition" has a fairly extensive section on pneumatic launchers, and compressed air potato guns have an impressive array of blow off valve designs. While I'm not advocating armaments, the designs are common to many pneumatic machines.
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