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portable pressure theory...

A place to ask general spud cannon related questions.
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Unread postAuthor: Hawkeye » Tue Mar 11, 2008 11:47 pm

You can use propane for airsoft. Every airsoft site shows you how to make an adapter to fill up with propane. Green Gas IS propane.
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Unread postAuthor: jimmy101 » Wed Mar 12, 2008 2:25 pm

The SpudWiki page on propane has the pressure versus temperature info. for propane.

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Unread postAuthor: rcman50166 » Wed Mar 12, 2008 2:38 pm

I would like to comment on the original topic. Basically the answer is yes, however it would not be a care free system, With dry ice you would need a pressure guage and be able to watch it as it approaches the maximum alotted pressure, then you would have to relieve it. You could solve that with a custom trip valve. A redundant system would be needed, perhaps a burst disk exaust port. So the final thought would be that such a dry ice gun would be expensive, complicated, somewhat dangerous, and scary as hell when the failsafe went off. But, in the end, the gun is doable in a practical manner.
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Unread postAuthor: jimmy101 » Thu Mar 13, 2008 11:10 am

rcman50166 wrote:I would like to comment on the original topic. Basically the answer is yes, however it would not be a care free system, With dry ice you would need a pressure guage and be able to watch it as it approaches the maximum alotted pressure, then you would have to relieve it. You could solve that with a custom trip valve. A redundant system would be needed, perhaps a burst disk exaust port. So the final thought would be that such a dry ice gun would be expensive, complicated, somewhat dangerous, and scary as hell when the failsafe went off. But, in the end, the gun is doable in a practical manner.

The OP has a "pressure releif valve (that lets the pressure only get to a certain level)"

Trying to do it manually while watching a pressure gauge would be suicide.

It wouldn't require a "custom trip valve". A generic safety pressure release, with a suitable pressure rating, would work fine. The pressure relief values used in hot water heaters springs to mind as being about right in terms of pop-off pressure and flow capability.

You would still need to worry about the pop-off freezing, the affect of the extreme cold on the strength of whatever the gun is made out of, etc.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 13, 2008 6:23 pm

propane as a propellant?

[youtube]http://www.youtube.com/watch?v=gy7WzXJTPNc&feature=related[/youtube]

yay!

:D
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Unread postAuthor: MrCrowley » Thu Mar 13, 2008 10:35 pm

A mouse would've stopped after the first time it caught fire and posed some threat :roll: :D
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Unread postAuthor: jimmy101 » Fri Mar 14, 2008 12:44 pm

jackssmirkingrevenge wrote:propane as a propellant?

yay!

:D

The moral is;
1. Don't use it if you are an idiot.
2. Don't use it if you are going to purposely try to light it.
3. Don't do it in a semi- or full-auto.

But other than that it's a great idea. :D
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Unread postAuthor: Jared Haehnel » Fri Mar 14, 2008 12:52 pm

This has been another episode of entertaining videos by Jack... stayed tuned for Idiots on fire...
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My current projects....

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