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Originally Posted by swt70611
I've looked at few of those on YouTube but haven't seem what they are using as a trigger/release. What's your idea on that?
Also saw a homemade one made of PVC pipe. Not sure I like that idea.
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The simplest release is a ball valve. We hope to use a 2" ball valve for simplicity, durability, and prevention of premature launches. I've seen designs with sprinkler valves and others also that provide faster initiation of air flow, but there are bait launchers getting 1000 ft with ball valves, which is more than we're hoping for.
You can get PVC rated for 300 PSI. Combined with only filling a pneumatic design to a max of 100 PSI, there should not be a problem. We've used PVC in several combustion designs with a sharp pressure rise and we've never had a failure. We've also used metal. Metal tubes have a lot more friction in the barrel and less uniformity which increases gas blow-by. IMHO, better to use properly rated PVC and keep pressures < 100 PSI.