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A thread for jacksmirkingrevenge

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
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A thread for jacksmirkingrevenge

Unread postAuthor: D_Hall » Sat Aug 27, 2011 2:05 pm

Now that it looks like my previous project is more or less operational, my boss has given me permission to build an explosively driven gas gun. Goal is 10,000 fps. :)
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Unread postAuthor: Labtecpower » Sat Aug 27, 2011 2:20 pm

Do you mean a light gas gun, or a combustion light gas gun?

Sounds like another fapworthy project :D
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Unread postAuthor: D_Hall » Sat Aug 27, 2011 2:30 pm

Labtecpower wrote:Do you mean a light gas gun, or a combustion light gas gun?

Sounds like another fapworthy project :D


Neither. I mean an explosively driven gas gun. That's what they're called.

Basic concept: Start with a 2-stage light gas gun. Now, throw away the powder charge and piston so you're left with a chamber full of Helium (or Hydrogen) and a barrel (with projectile, of course). Now wrap that chamber with plastic explosives.... Detonate the explosives and you find that your Helium is suddenly under pretty extreme pressure.

BOOM.

I personally think the name "implosion gun" makes more sense, but as I didn't invent them I don't get to name them.

As you may expect, performance is very similar to a 2-stage light gas gun, but they're VERY cheap to manufacture and use by comparison. The only downside is that you can't use 'em indoors. ;)


Some light reading on the topic....

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Unread postAuthor: ramses » Sat Aug 27, 2011 3:08 pm

D_Hall wrote: The only downside is that you can't use 'em indoors. ;)


Or more than once :D
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Unread postAuthor: Labtecpower » Sat Aug 27, 2011 4:03 pm

Ah, now I understand!

I can imagine that this is much less complicated to build, compared to a 2-stage light gas gun.

I think the licenses take greatest amount of time?
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Unread postAuthor: Technician1002 » Sat Aug 27, 2011 4:12 pm

Was this thread received the mod's approval? I mean the main source of power is of questionable nature..
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Unread postAuthor: Fnord » Sat Aug 27, 2011 4:36 pm

I think they may be able to make an exception, seeing as how this is D. Hall's job. The main reason for the rule is to keep the site from getting bad media attention, but I don't think this is quite the same as a bunch of hobbyists blowing stuff up.

(even if it's for science:))

Anyway...
David, will you actually be able to post details about this project as it evolves?
How is the red tape/BS looking?
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Unread postAuthor: MrCrowley » Sat Aug 27, 2011 4:37 pm

Technician1002 wrote:Was this thread received the mod's approval? I mean the main source of power is of questionable nature..

That's a good point. Personally, I'll let it slide because it is a legal and commercial venture. If another Mod or PCGUY thinks otherwise, so be it.
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Last edited by MrCrowley on Sat Aug 27, 2011 7:50 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Sat Aug 27, 2011 4:40 pm

D_hall is definitely an exception...
This sounds cool... 8)
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Unread postAuthor: D_Hall » Sat Aug 27, 2011 4:51 pm

Labtecpower wrote:I can imagine that this is much less complicated to build, compared to a 2-stage light gas gun.

It's not so much a complexity issue as it is a logistics issue. 2-stage gas guns are MASSIVE pieces of equipment that are very expensive to build. Imagine a piece of pipe 3' in diameter with only a 6" ID and you get the idea. EDGs, by comparison, can be made out of off the shelf sch 20 pipe. Well, not the barrels, but the rest of the gun.

I think the licenses take greatest amount of time?

What I'm already licensed to do makes anything ever mentioned on this webpage look like child's play.

HINT
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Unread postAuthor: jimmy101 » Sat Aug 27, 2011 4:55 pm

Dave might not need a license but he still files mountains of paperwork. I suspect that before the first firing Dave will have spent as much time on paperwork as on the designing.
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Unread postAuthor: D_Hall » Sat Aug 27, 2011 4:56 pm

Fnord wrote:David, will you actually be able to post details about this project as it evolves?
How is the red tape/BS looking?


1) Unknown. Right now we're at the "It's just an idea I've thrown on the table and the boss doesn't mind but it's not an official project or anything like that so it's all really nothing more than water cooler talk," stage. But then, ya'll know about that from past experience.

2) Haven't even tried to clear that yet. Still collecting meaningful data and looking into release mechanisms (read: professional conferences).
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Unread postAuthor: D_Hall » Sat Aug 27, 2011 4:58 pm

jimmy101 wrote:Dave might not need a license but he still files mountains of paperwork. I suspect that before the first firing Dave will have spent as much time on paperwork as on the designing.


LOL... Now THAT is a true statement. Absolute. Truth.
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Unread postAuthor: jrrdw » Sat Aug 27, 2011 7:09 pm

D_Hall wrote:
Labtecpower wrote:Do you mean a light gas gun, or a combustion light gas gun?

Sounds like another fapworthy project :D


Neither. I mean an explosively driven gas gun. That's what they're called.

Basic concept: Start with a 2-stage light gas gun. Now, throw away the powder charge and piston so you're left with a chamber full of Helium (or Hydrogen) and a barrel (with projectile, of course). Now wrap that chamber with plastic explosives.... Detonate the explosives and you find that your Helium is suddenly under pretty extreme pressure.

BOOM.

I personally think the name "implosion gun" makes more sense, but as I didn't invent them I don't get to name them.

As you may expect, performance is very similar to a 2-stage light gas gun, but they're VERY cheap to manufacture and use by comparison. The only downside is that you can't use 'em indoors. ;)


Some light reading on the topic....

Link removed


The forum rule:

3.Discussion of solid propellants, explosive devices or incendiary projectiles fired specifically from a spud cannon is prohibited, and may result in a permanent banning of your account.For the purpose of this forum, these definitions will be used:
a. Solid propellant: Any substance containing all the chemical elements required to enable sustained combustion without the presence of additional oxidizers. This includes but is not limited to gunpowder, thermite, and many commercial and/or homemade pyrotechnic compounds.

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