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meters

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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meters

Unread postAuthor: sandman » Thu Mar 29, 2007 8:11 pm

ok, i have seen many propane meters on this site and if i get ABS i will use one too

but for sleekness i was wondering if it is ok to use flexable pipe in the meter, all i have seen use solid pipe, but thats is kinda not an option for me
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Unread postAuthor: noname » Thu Mar 29, 2007 8:19 pm

Yes, although it'll be annoying calculating the volume on it, considering it would bend and probably doesn't have an exact ID. Do some experimenting with it.
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Unread postAuthor: ArticWolf » Fri Mar 30, 2007 3:57 am

I am sure that if you use pressure rated propane tank hose, (keeps ID the same) or gas line for the house (not sure if it pressure rated though) but that might work. If you can make one from black pipe and fittings to put it together you can use the hose to put it on your cannon. It may be clusey with the all metal pipe and the other good stuff, but it makes the cannon look more stafistacated looking. (this is my opinon no cut down intended) Mine is not attached to the cannon it makes mine less bulky.
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Unread postAuthor: sandman » Fri Mar 30, 2007 2:29 pm

with the setup that i plan to use it will be very odd to have solid pipe on it

to get volume cap one end, fill with water, measure water
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Unread postAuthor: ArticWolf » Sat Mar 31, 2007 1:30 am

The way that I use mine should work for your idea. I have a shrader valve (IE Valve stem for tires) that is on the double thick part at the back of the cannon. I used an air chuck (like the tire pumps have to fill your tires up) on my metering pipe it makes it completely Separate from the cannon the shrader valve and the air chuck both act like a ball valve. If I got you right you want to measure water with this too? I am just trying to help but not sure if I am on the same idea.
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Unread postAuthor: sandman » Sat Mar 31, 2007 8:12 am

no no, i would use the water to find the ID so i would know how much to meter
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Unread postAuthor: ArticWolf » Sat Mar 31, 2007 12:02 pm

Well this might help you, http://www.advancedspuds.com/SpudToolonline.htm I have used it on my cannon. If you know what size the chamber and the barrel is, this will help you find out what size and length the meter pipe is to be and how much propane % (I use 5% but a good one is 4%) to use and the amount of propane pressure to use. A pefect C:B ratio is 1.5:1. Oh I think it tells you the ID of the meter pipe too. I hope I got it right this time :)
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Unread postAuthor: SpudBlaster15 » Sat Mar 31, 2007 1:23 pm

ArticWolf wrote:Well this might help you, http://www.advancedspuds.com/SpudToolonline.htm I have used it on my cannon. If you know what size the chamber and the barrel is, this will help you find out what size and length the meter pipe is to be and how much propane % (I use 5% but a good one is 4%) to use and the amount of propane pressure to use. A pefect C:B ratio is 1.5:1. Oh I think it tells you the ID of the meter pipe too. I hope I got it right this time :)


1) The size of the barrel does not matter when you are attempting to determine the proper meter pressure.
2) The air/propane mixture is a user selected input, though the calculator does have the proper mixture set as a default (It isn't 4% or 5% either).
3) 1.5:1 is a loud, inefficient ratio, and very far from "perfect".
4) The inside diameter of the meter pipe is also a user selected input.
5) If you are ever questioning the validity of your information, and simply hope that it is correct, it is time to go back and ensure that it actually is.

Sandman, the water displacement method is very effective when it comes to measuring the volume of an irregular contraption, use it. From there, it should be easy to calculate the proper pressure required. If you give me your chamber and meter volumes, I will give you an accurate estimate to start off with. Or, you can work backwards using the calculator posted by ArcticWolf.
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Unread postAuthor: sandman » Sat Mar 31, 2007 4:01 pm

well, i allready did the calculations, i know i need bout .5876 psi in the chamber of propane, so ill use P1V1=P2V2 when i get the hose, to get the pressure in the hose i need
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Unread postAuthor: noname » Sat Mar 31, 2007 4:17 pm

"i need bout .5876 psi in the chamber of propane"
It's going to be EXTREMELY hard to get that amount in, why not use a smaller meter?
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Unread postAuthor: sandman » Sat Mar 31, 2007 4:47 pm

but that = 4% propane
i thought that was the best percentage
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Unread postAuthor: hi » Sat Mar 31, 2007 4:54 pm

it is4% it almost exactly right. i have used hose on all my meters and it works just as well as pipe. just make sure its pressure pipe and that th hose clamps are nice and tight, mine hold about 50 psi before they leak, witch is way to much for propane and way. you can even put a pressure gauge on it.
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Unread postAuthor: noname » Sat Mar 31, 2007 5:50 pm

Make the meter smaller, and increase the pressure, so you're not trying to meter in .58 psi.
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Unread postAuthor: Freefall » Sat Mar 31, 2007 6:10 pm

Noname, he's not trying to measure that pressure. He's stating that .58 psi is about 4% of 14.7 psi, and that he needs that much propane in the CHAMBER. To do so, he'll use P1V1 = P2V2 to determine the pressure that he needs in his (much smaller) METER.
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Unread postAuthor: sandman » Sat Mar 31, 2007 6:51 pm

yes, exactally what he said
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