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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: dewey-1 » Wed Nov 28, 2012 11:18 pm

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Unread postAuthor: PaperNinja » Thu Nov 29, 2012 6:55 am

Looks like adapters aren't too hard to find on ebay: http://www.ebay.com/sch/i.html?_odkw=sp ... T&_sacat=0
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Unread postAuthor: PaperNinja » Sun Dec 02, 2012 3:47 pm

How much pressure d'ya suppose the in stock barrels here can take?

Or the .177 in stock barrel?
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 02, 2012 3:49 pm

I reckon you could use them for a 22LR rimfire, at least 10,000 psi.
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Unread postAuthor: PaperNinja » Sun Dec 02, 2012 3:56 pm

Even the .22?

Larger ID + same OD = thinner walls = less pressure, I'm thinking.
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Unread postAuthor: jakethebeast » Sun Dec 02, 2012 3:58 pm

But as you see, the bigger calibre barrels are thicker. Normally .308 barrels are not very thick, and the pressure is pretty much more than your average spudgun :wink:
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Unread postAuthor: PaperNinja » Sun Dec 02, 2012 4:00 pm

The thickest barrel for both .177 and .22 has .630 OD
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 03, 2012 1:35 am

Even the smallest OD 0.22" barrel offered on that page will be suitable for at least rimfire firearm pressures.
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Unread postAuthor: PaperNinja » Thu Dec 06, 2012 9:53 pm

Ok so last question...

These say they're rated for 6500 psi, but the description also says: "Note: Pressure ratings given are for static (constant) pressure conditions."

Should these be ok for pressure spikes at a max of 5000---or possibly more (<6000)---psi?


Edit, oops, it doesn't link to the specific type. Anyway, they're shutoff valve quick disconnects rated to 6500 psi (static).
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Unread postAuthor: DigitalSpuds » Tue Dec 11, 2012 3:12 pm

For the discussion about best barrel types and distance, I found this article comparing barrel length, type of valve, etc. to get the best combination.

http://www.sigmazone.com/Taguchi_L12_SpudGun.htm
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Unread postAuthor: MrCrowley » Wed Dec 19, 2012 10:52 pm

Okay, so I picked up one of these because my stungun stopped working and even though it's >30kV, I'm worried that it is only able to jump a 10mm gap. Does anyone think this may be a problem for 10x hybrids? I know piezo sparkers have no trouble but all the ones I've tested can jump closer to 20mm.

Apart from that, it's a nice piece of equipment. I'm fairly pleased with it even though it was $30; it sparks much nicer than those BBQ push-button sparkers that also operate on AA batteries.

Because I'm using it in conjunction with my new 12V LED controller for remote ignition I have to use one 9V battery wired in series with three AAA batteries to get the 12V controller to operate, then I have to step-down the output to 5V using a 12V USB car charger and then I have to step-down the output of that using three 1N4004 diodes in series to get ~3V @ 700mA for this electric sparker :lol:

edit: the unit is smaller than it looks and is quite tidy with good insulation. Unlike with the stun gun circuit I was using, I don't think this one will short-circuit.
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Unread postAuthor: PaperNinja » Fri Dec 21, 2012 11:19 am

Is discussion of solid propellants legal in a PM?
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 22, 2012 4:26 am

They're private messages by definition, make of that what you will ;)
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Unread postAuthor: Lockednloaded » Sun Dec 23, 2012 1:02 am

More of a curiosity question:

If I were to flip a QEV diaphragm around and drill a hole through the middle, would it work as a chamber sealing valve?
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Unread postAuthor: pneumaticcannons » Sun Dec 23, 2012 7:22 am

Heh, actually a pretty cool idea. In theory, I don't see why it would't work, however, in practice, the "skirt" around the qev might give away.
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