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would this work for my spudgun?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: spud-freak » Fri Feb 04, 2011 6:40 am

does anybody understand a little bit german here? :-)
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 04, 2011 6:58 am

spud-freak wrote:does anybody understand a little bit german here? :-)


Only if Till Lindemann is shouting it :D
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Unread postAuthor: The_Guerilla_Guy » Fri Feb 04, 2011 9:17 am

does anybody understand a little bit german here? Smile

In fact, I do yes^^
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Unread postAuthor: Crna Legija » Fri Feb 04, 2011 9:55 am

Jörgs does
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Unread postAuthor: Technician1002 » Fri Feb 04, 2011 9:59 am

The problem with metering with a pressure gauge is the simple fact that screw on clean out caps don't reliably seal. If it leaks some, your mix will be way off. A volumetric meter can tolerate some chamber leakage and still be very close to the proper mix.
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Unread postAuthor: spud-freak » Fri Feb 04, 2011 12:54 pm

oukey i've testet it, but i can't so little set the propane-butane gas
because i don't have a little gauge for this mini pressures..

tomorrow i want to build a hybrid gun with steel pipes!
a 1x mix i not so efficiently, whitch mix do you need?
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Unread postAuthor: Technician1002 » Fri Feb 04, 2011 4:01 pm

To find a very low pressure gauge, you want something used to monitor the pressure on air filters and such on commercial HVAC systems. Warning, they are not cheap.

I would recommend something from this page, but they are too sensitive for your application as many only measure up to 2 inch or 4 inch. You need one in the 20 inch WC range. You are looking to measure pressure in the 16 inch Water column range.
http://www.terrauniversal.com/measuring-recording/magnehelic-photohelic-gauges.php

This one will work, but you will not like the price.
http://www.grainger.com/Grainger/MIDWEST-INSTRUMENT-Differential-Pressure-3GVH6
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Unread postAuthor: metalmeltr » Fri Feb 04, 2011 5:09 pm

No it wont those are designed to be mounted in a wall to measure pressure diferentilal between the two sides, th only way it would work would be to have a large flat area on the cannon to mount/seal it to.

This is a paint booth with a similar gauge installed to measure pressure in the booth.

Image
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Unread postAuthor: saefroch » Fri Feb 04, 2011 5:33 pm

cfb_rolley wrote:So, how come metering a mix by measuring chamber pressure rise isn't commonly suggested? To me, that seems like the most simple method of metering, because all you'd need is a sealed chamber, a propane bottle connected to the chamber and a pressure gauge?
That works great if you have a sealed chamber and can measure minuscule amounts of pressure, which most of us can't. Can you reliably measure 0.654psi?

If I were you, I'd go with JSR's suggestion and try syringe fueling. If you have a >351mL syringe, that is...
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Unread postAuthor: metalmeltr » Fri Feb 04, 2011 5:49 pm

18.1 inches of water
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Unread postAuthor: saefroch » Fri Feb 04, 2011 6:32 pm

metalmeltr wrote:18.1 inches of water
I know that wasn't an answer to my question, but that leaves me horribly confused. Don't you need a given diameter for the cylinder?
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Unread postAuthor: Technician1002 » Fri Feb 04, 2011 6:35 pm

Inches of water is the height the pressure will push water up a tube. Diameter doesn't matter.
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Unread postAuthor: metalmeltr » Fri Feb 04, 2011 6:44 pm

presure per a given area ia pressure per a given area

psi
lbs per square inch

The basis of pascals principle.
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Unread postAuthor: saefroch » Fri Feb 04, 2011 7:37 pm

Oh duh wow. I'm amazed I possibly missed that. I thought the question sounded stupid when I posted it...

So I does the height of the column of water doesn't matter too?
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Unread postAuthor: metalmeltr » Fri Feb 04, 2011 8:05 pm

I dont think so, but it may, I THINK it is just is the diference in height
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