Rapid shooting combustion

Post questions and info about combustion (flammable vapor) powered launchers here. This includes discussion about fuels, ratios, ignition systems and anything else relevant to launchers powered by igniting things like hairspray or propane.

Postby theexp » Thu Nov 09, 2006 11:07 pm

Recently I've been working on my new reeftank. For flow for my coral I am making a sinusoidal valve to create "random" flow in my tank. I thought that you could put the valve to good use, as a distributor in a spudgun. SO basically there is a drum that spins in a piece of PVC with 4 different outlets/inlets. So when the drum rotates the hole in the drum is opened to the different inlets. For the potato cannon instead of a wider hole it'll be just the size of pvc and have a few o rings or such to seal it.

<img src="http://i13.tinypic.com/2eb7hi9.jpg">
<img src="http://i117.photobucket.com/albums/o77/theexp435/Sinusoidalvalve030.jpg">

It could either be used to inject air to vent then propane into one chamber and do that rapidly (instead of a one rpm motor like i'm gonna use use a 5 rpm or faster). The only problem with this is a way to measure propane out. I was thinking about having it timed with the valve but thats not accurate enough, so maybe a solenoid that fills up a meter pipe then the sinusoidal valve will release it. or have it injecting mixed fuel and air into 4 different chambers.
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