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Question about pressure in firing chamber

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Question about pressure in firing chamber

Unread postAuthor: vng21092 » Sat Nov 23, 2013 7:16 pm

I just saw this post http://www.spudfiles.com/pneumatic-cannon-database/topic24091.html and since it was posted a while ago, I'm not sure if OP is still around to answer my question. When the chamber/stock is pressurized and the slide valve is opened, how much pressure actually goes into that little firing chamber in the QEV? I mean I might be interpreting this wrong but he says he pumped it to 150psi, so when the slide valve opens wouldn't the pressure in the firing chamber raise by just a tiny amount?
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Re: Question about pressure in firing chamber

Unread postAuthor: jackssmirkingrevenge » Sun Nov 24, 2013 6:35 am

Maybe you're not getting how it works, here's a pretty exhaustive explanation: pneumatic-cannons/topic25108.html?hilit=atmosphere%20qev#p365630
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Re: Question about pressure in firing chamber

Unread postAuthor: vng21092 » Sun Nov 24, 2013 8:16 am

yup, I thought how that works, my question was how much pressure is in the firing chamber after it's charged, since the firing chamber is so small?
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Re: Question about pressure in firing chamber

Unread postAuthor: zeff » Sun Dec 22, 2013 4:35 am

Pretty simple stuff, the pressure will equalize on both sides. If the hole is small it might just take a bit longer.
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