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A couple of (newbish?) questions

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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A couple of (newbish?) questions

Unread postAuthor: Xalexalex » Sun Aug 28, 2011 7:10 am

Hello everyone!
I'm planning on building my first spud cannon. Wanting to do something more advanced than a plain spray-and-pray, I began to do some resarch on the fueling system and materials.

For practical reasons (weight and dimensions) I thought of a simple "valve" attached to the combustion chamber, to be used with a disposable butane cartriged like the following

Image

In my mind I picture myself "pressing" this cartridge on the valve, which will open due to the pressure from the cartrige, letting the butane in. Much like when you refill a lighter, I guess.
My question is: does a valve like that exist? And if it does, will it substain the pressure from the inside, when the butane ignites?

As for the materials, I got interested in PVD-F (that is polyvinyldene-fluoride), which *in theory* is capable of sustaining greater pressures than PVC, PP or ABS plastics, but I couldn't find any practical info nor a direct experience on this.

I'll be glad if you could share your knowledge with me =)

All the best!
Alessandro
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Unread postAuthor: Crna Legija » Sun Aug 28, 2011 7:19 am

The valve does exist you could take one from a camping stove that uses them cans, but it would be just like any other spray n pray cannon because you are not metering fuel into the chamber.

The pressure from a spray n pray is about 40-60psi more or less the same in a propane cylinder, so yeah if you can attach it the the cannon good it should hold the pressure.
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Unread postAuthor: Xalexalex » Sun Aug 28, 2011 7:33 am

Any thoughts on the PVD-F idea?
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Unread postAuthor: saefroch » Sun Aug 28, 2011 10:32 am

If you want to handle more pressure than pressure-rated PVC or ABS fittings can easily sustain, just use metal. There's no reason to be using plastic.
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Unread postAuthor: Xalexalex » Sun Aug 28, 2011 11:05 am

Money, maybe? :D
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 28, 2011 11:23 am

Xalexalex wrote:Any thoughts on the PVD-F idea?


If it can take 100 psi without shattering, why not ;)

As to fuelling, here's a self-explanatory thought:
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Unread postAuthor: Xalexalex » Sun Aug 28, 2011 11:31 am

I like the idea, but I was looking for something... quicker to use. I'll check the home depot in a couple of days, see what I can find.

Btw, is there an introductions thread here? I couldn't find it anywhere =/
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Unread postAuthor: mattyzip77 » Sun Aug 28, 2011 11:51 am

[quote="Xalexalex"]I like the idea, but I was looking for something... quicker to use. I'll check the home depot in a couple of days, see what I can find.

Btw, is there an introductions thread here? I couldn't find it anywhere =/[/quote
Yes, I believe its called the "search" button, and the "wiki"!! Welcome to the forum!! :D :D
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 28, 2011 11:52 am

Xalexalex wrote:I like the idea, but I was looking for something... quicker to use. I'll check the home depot in a couple of days, see what I can find.


You can cut out the syringe, ball valve and check valve - but then you have no means of correctly dispensing the right amound of gas, so you've made a spray'n'pray.

Btw, is there an introductions thread here? I couldn't find it anywhere =/


You're in it ;)
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Unread postAuthor: Technician1002 » Sun Aug 28, 2011 12:06 pm

A simple syringe meter is not hard to make.

A piece of tube will do the job.
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Unread postAuthor: ramses » Sun Aug 28, 2011 12:10 pm

jackssmirkingrevenge wrote:
Xalexalex wrote:I like the idea, but I was looking for something... quicker to use. I'll check the home depot in a couple of days, see what I can find.


You can cut out the syringe, ball valve and check valve - but then you have no means of correctly dispensing the right amound of gas, so you've made a spray'n'pray.

Btw, is there an introductions thread here? I couldn't find it anywhere =/


You're in it ;)



Use a 3 way valve and a meter pipe. If combined with a fan vent, 5-10 shots per minute should be do-able.
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Unread postAuthor: Xalexalex » Sun Aug 28, 2011 12:15 pm

I'll check the other threads to get some inspirations =)
Thank you all!
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Unread postAuthor: jimmy101 » Sun Aug 28, 2011 3:30 pm

Following up on tech's post.

Other ways to do it;
Image
Image
Image
Image

all from the wiki http://www.spudfiles.com/spud_wiki/imag ... up_158.jpg

edit: and one not on the wiki:
Image
editedit: btw, the last one is both a meter and an ignition system.
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Unread postAuthor: Crna Legija » Mon Aug 29, 2011 2:14 am

Xalexalex wrote:I'll check the other threads to get some inspirations =)
Thank you all!



ahhh finally :D
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