Pneumatic
Spud Shooter
This cannon uses compressed air as the propellant. Compressed air is much more
easy to regulate and hence, can propel ammo further that their ignition based
counterparts. This guide includes instructions for making the diaphragm that controls the
firing of the object.
Testing of hairspray spud guns revealed they can develop no more than
10-20 PSI chamber pressure. Most are built from schedule 40 PVC pipe. 3" PVC pipe has
a burst pressure of 260 PSI. People have suggested using other fuels to boost pressures
higher, however this is much to dangerous. More volatile fuels can be very unpredictable
and create pressures that would shatter the PVC pipe. Compressed air can be regulated to
exact pressures making it an excellent propellant. The trick is releasing a large volume
of air at once to launch the projectile. Here's how it's done...
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