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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: wyz2285 » Sun Nov 06, 2011 12:42 pm

I don't have a pic, a link os possible but not sure if it has English. So the 800 one can't be regulated to 400, but the 400 one can be regulated to 800?
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Unread postAuthor: Zeus » Sun Nov 06, 2011 9:52 pm

Tech, you're right, glowplug engine fuel won't work well, but pure nitromethane is another matter entirely. It will work, too well. Your air rifle will become many little projectiles.

Accuracy will go down however.

Nitromethane is fascinating when mixed with NH<sub>4</sub>NO<sub>3</sub> too. :wink: [/list]
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Last edited by Zeus on Mon Nov 07, 2011 7:04 pm, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 07, 2011 12:48 am

Zeus wrote:Nitromethane is fascinating when mixed with NH<sup>4</sup>NO<sup>3</sup> too.


Image <(It is!)
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Unread postAuthor: Gippeto » Mon Nov 07, 2011 1:28 am

wyz,

The ninja reg started off at 850psi. With the correct springs and shims, it can go either up...or down.

Let's have the link eh?
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Unread postAuthor: wyz2285 » Mon Nov 07, 2011 11:27 am

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Unread postAuthor: Gippeto » Mon Nov 07, 2011 12:16 pm

Re-ranging either one should be entirely do-able. :)

What pressure were you looking to get out of it?

For pressures above 800psi, you'll need to find a source of belleville washers and shims ~.005"-.020" thickness that will fit in the reg housing. I got my bellevilles from Fastenal...shims are Ninja items. Not sure what's available in Portugal? Will measure them tonight if you'd like?

Might be a rebuild kit available from the manufacturer as well that contains some of the parts required.

Will post a pic of my test rig later...simple and inexpensive.
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Unread postAuthor: wyz2285 » Mon Nov 07, 2011 12:28 pm

I´m not decided about the pressure :? with 800 psi I would have a semi/full auto bbs gun with supersonic muzzel velocity and I can use lead/steel bbs, but too powerful for my original purpose. With 400 psi I would get a great airsoft gun, but when it fires lead bbs...
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Unread postAuthor: Gun Freak » Mon Nov 07, 2011 12:58 pm

Sorry if I missed something but couldn't you use either one for either pressure? That way you can use higher pressure when you want to shoot lead and lower it to shoot BBs. Is it a lot of work to change the output pressure?
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Unread postAuthor: wyz2285 » Mon Nov 07, 2011 1:37 pm

I don´t know if it´s a lot of work changing the output pressure, but buy two regulator is too expensive for me
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Unread postAuthor: Gippeto » Mon Nov 07, 2011 2:22 pm

Not a lot of work..vent the bottle COMPLETELY..the bonnet is threaded on...remove a grub screw, thread it off.

Sensing piston usually comes out with the bonnet. Change the spring/belleville/shim stacks and re-assemble.

Attach to test rig, start filling bottle...watch gauge on test rig....if gauge stops moving, or gets close to burst disk rating...stop, vent bottle completely...make another adjustment...re-test. When the gauge stops moving where you want the pressure set...you're done.

Test rig is made from one of these, with an 1/8"npt valve of suitable rating where the hose would attach. Simple, effective...and cheap. :wink:

http://www.ebay.ca/itm/Paintball-Co2-Fi ... 2a159de573
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Unread postAuthor: wyz2285 » Mon Nov 07, 2011 2:29 pm

That thing allows me to choose any pressure I want??
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Unread postAuthor: Gippeto » Mon Nov 07, 2011 3:01 pm

NO.

The test rig will allow you to verify the output pressure of the regulator...which you will alter by changing the springs and shims inside the regulator.
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Unread postAuthor: SpudBlaster15 » Mon Nov 07, 2011 3:04 pm

Technician1002 wrote:The mix is typically 5-10% Nitro-Methane with the remainder Methyl Alcohol fuel and Castor oil for lubricant. Hot mixes go up to about 25% Nitro.


Modern blends use primarily synthetic lubricants, with a small percentage (~2% of the total volume) of castor oil thrown in to offer more effective high temperature/pressure lubrication.

Additionally, 25% is by no means a maximum value for nitromethane content; car fuels can be as high as 30-40%.

Zeus wrote:NH<sup>4</sup>NO<sup>3</sup>


Brilliant use of subscripts there Zeus. :wink:

But yes, nitromethane is rather interesting when mixed with NH<sub>4</sub>NO<sub>3</sub> and a touch of finely divided reactive metal.
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Unread postAuthor: Zeus » Mon Nov 07, 2011 7:07 pm

Touché SB, nice advertising too, though you're preaching to the converted here.
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Unread postAuthor: apocavorme » Sun Nov 13, 2011 6:02 pm

hi to all, i was thinking in making something like this:
http://www.spudfiles.com/forums/i-too-h ... 21039.html
or this:
http://www.spudfiles.com/forums/m21e600 ... 22638.html

but i have a question: what prevents the ammo from fallin in the qev when it is beeing loaded? assuming the hole of the qev is same size of the ammo

Thak u for attention!
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