SpudFiles

Hello!
i would like to say to you i'm french so sorry for my faults
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:


the chamber


the quick ventilation:


the chambre with the barrel:


and a little video of a shoot without barrel:



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

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?

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

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...

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!

its a shame about the language barrier because the French forum make some realy creative cannons

...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

What? you mean the French do have faults after all....?? 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.

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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