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patator cg 3500

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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patator cg 3500

Unread postAuthor: julien_62 » Wed Jan 28, 2009 2:40 pm

Hello!
i would like to say to you i'm french so sorry for my faults :D
Sometimes i speak with a translate so...
My name is julien and I am 15
I have some airguns, a combustion canon and an hybrid
today,i will present my combustion canon
I'm from patator'forum

-chamber diam.100
-barrel diam.40
-combustion canon with direct injection (mix 30% propan/70%butane)
-system flash for the ignition
-handle control for the ignition and the fan
-fan vacuum for quick ventilation
-ratio 1;7
-system quick ventilation

some fotos:
Image

the chamber
Image

the quick ventilation:
Image

the chambre with the barrel:
Image

and a little video of a shoot without barrel:

http://fr.youtube.com/watch?v=_KvJCGF22 ... ting.forum

If I have time i will present my hybrid canon



(the airgun of one of my friends:(on http://patator.frbb.net)
I wanted to present
---> http://patator.frbb.net/vos-pacs-person ... -t4165.htm
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Unread postAuthor: psycix » Wed Jan 28, 2009 3:09 pm

Looks good but there are some (safety) issues.

1 That hose, Is it properly glued in?
2 You are using a brushed motor to rotate the fan. Brushed motors can spark and thus that means possible unwanted ignition.
3 You are holding your hand on a fueled chamber.

I'll say it again:
YOU ARE HOLDING YOUR HAND ON A FUELED CHAMBER
Never do that again okay?


How do you know how much fuel you are injecting? Simply counting the seconds or what?
How is the barrel connected? You are not simply shoving it in are you?
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Unread postAuthor: julien_62 » Wed Jan 28, 2009 3:39 pm

hi
It's sticking with résine / epoxy.
for the fan, i have never problems of unwanted ignition
when i did the video i didn't know that the fan with brushed motors did unwanted ignition but i have never this problem with my combustion canon.

For the mix i count 10 seconds and the quick ventilation i count 5 seconds
i would like to put a meter on my combustion canon
but the pvc in France is not very resistant contrary to your pvc
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Unread postAuthor: Brian the brain » Wed Jan 28, 2009 3:52 pm

I have seen French built cannons made of pressure rated PVC before.
So you should be able to get it, je croix
Guys, help me out here...
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Unread postAuthor: ALIHISGREAT » Wed Jan 28, 2009 4:04 pm

Good use of French there BtB, Je parle un peu de fracais mais je ne suis pas bien! (je pense que j'aurai un A a GCSE)

its always good to practice!
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Unread postAuthor: maggotman » Wed Jan 28, 2009 5:10 pm

its a shame about the language barrier because the French forum make some realy creative cannons
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Unread postAuthor: psycix » Wed Jan 28, 2009 6:39 pm

...and hold their hand in front of it.

Oh btw, julien, most people leave the fan on during firing. This increases the power of your shot by an extra few %.

the chambre

lol
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Unread postAuthor: starman » Wed Jan 28, 2009 6:52 pm

What? you mean the French do have faults after all....?? :wink: And ah yes, there's some of that famed horribly expensive and always super rare French PVC... 8) In any case, a hardy welcome to Spudfiles!!

I would just like to reiterate psycix comments about the electric motor with brushes. I'm frankly surprised it didn't fire while you were loading the fuel. I know you may not have had trouble so far, but a motor with brushes is a major no-no in a combustion chamber. I like your side ways mounting, just use a brushless motor like a computer case cooling fan.
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Unread postAuthor: iknowmy3tables » Tue Feb 23, 2010 10:17 pm

you don't need pressure rated PVC to build a feul meter, use what ever kind of pipe you can get that is safe for pressure,
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Unread postAuthor: SpudBlaster15 » Sat Feb 27, 2010 4:27 pm

starman wrote:I would just like to reiterate psycix comments about the electric motor with brushes. I'm frankly surprised it didn't fire while you were loading the fuel. I know you may not have had trouble so far, but a motor with brushes is a major no-no in a combustion chamber. I like your side ways mounting, just use a brushless motor like a computer case cooling fan.


psycix wrote:2 You are using a brushed motor to rotate the fan. Brushed motors can spark and thus that means possible unwanted ignition.


In my testing, the sparks produced at the brushes/commutator interface are not sufficiently energetic to ignite a propane/air mixture. Several members on this forum have used handheld camping fans with brushed motors in their combustion launchers, and as far as I know, there has never been a report of accidental ignition.

You may run into issues with mixtures that are extremely sensitive to ignition, such as pure oxygen and acetylene/hydrogen, but for normal spudding fuels, there isn't much risk.
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