A hybrid potato gun is a mixture between the combustion and a pneumatic variety. Simply put, you add compressed air, and extra fuel to the chamber before ignition. The pressure is held in the chamber via a burst disk or burst diaphragm. There are also hybrids that utilize valves, much like a pneumatic. My hybrid spudgun uses the burst disk method. I must warn anyone attempting to create a hybrid, that they create extreme power, pressures and heat. Sch40 launchers have been made, but I cannot stress the dangers of this enough. A sch80 chamber is the bare minimum you should attempt a hybrid with. Should you attempt a hybrid? If you are absolutely confident in your skill levels, in other words, both your spudgun knowledge and your construction techniques, you might attempt one. But... honestly, not to sound like an elitist or anything, a hybrid should not be attempted unless you have an extremely vast amount of spudgun experience. This means both pneumatics and hybrids, fuel meters... etc. I had built probably 20 spudguns before attempting a hybrid, and have done many years of research. They really are stepping up to the proverbial "next level." If you mess up on a combustion or a pneumatic, you are out a few dollars. If you mess up on a hybrid, you are dead.
This page is currently under construction, more info to come soon
spark gaps: info soon
fuel: info soon
fuel/pressure relations and a chart:
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