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My first BigGun :D

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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does the paint stays good on this gun?

yes
3
75%
no
1
25%
 
Total votes : 4
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My first BigGun :D

Unread postAuthor: wyz2285 » Sat Mar 12, 2011 1:12 pm

Hello everybody
Well I have been planing on building a decent spudgun for about a month ago when I was bored with airsoft guns, but didn´t have time to really think about it, as I had to study for some test.
Finally when I got a week to think about a design. Initially I wanted to build it in full aluminum, as I´m not familiar with combustions and they looks dangerous :? .
But I just couldn´t find any large-bore aluminum tubes and accessories :!: ,
so I had to use PVC :shock: , but I really consider that´s not safe enough. Any way, I finished it and fired it 5 time till now :?, haven´t get enough courage to fire more times :oops: .
specifications:
basic gun design: co-axial.
barrel: 1 metre long 3 cm dia pvc
chamber:about 40 cm long 9 cm dia pvc, prox 1 L volume with chamber fan.
Ignition: 1.5 V continue spark ignition.
fuel: butane(I couldn´t find propane, only butane and MAPP)
I use syrige fuel injection.
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Attachments
IMG142.jpg
The gun and the syringe injection system, the little thing connected to the syring is a moded lighter gas tank.
IMG147.jpg
I also painted it, looks good :)
IMG146.jpg
IMG148.jpg
IMG151.jpg
Chamber fan. I used a co-axial design on this gun.
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Unread postAuthor: Gaderelguitarist » Sat Mar 12, 2011 1:33 pm

Those are the most strange pvc fittings I've ever seen. Be sure to check that they are indeed rated for pressure.
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so many muchness
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 12, 2011 1:39 pm

Gaderelguitarist wrote:Those are the most strange pvc fittings I've ever seen.


Those of us in Europe think the same of your white PVC ;)

Nice job wyz2285 and yay for syringe metering :)
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Unread postAuthor: wyz2285 » Sat Mar 12, 2011 3:24 pm

The pvc tube are a self close type, they have a rubber ring in the inside, so i don't have to glue them, only need use few screws to make sure they stays together :D . Ya the syringe looks like the easiest way to inject fuel to me so i used it :)
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Unread postAuthor: Labtecpower » Sat Mar 12, 2011 3:34 pm

I wouldn't trust the self-sealing types. I have seen them at the local DIY store
(GAMMA!)
a few years ago (when I wanted to make the same type of gun :D)
They are pretty thin-walled.
Also, do not underestimate the amount of force applied to the caps and screws. A combustion gun generates about 6 bar (kg/cm 2)

There are several vids on youtube with guns of this type exploding.

But: the gun itself looks very good. It looks clean, and well constructed. (apart from the used material :wink:)

I'd like to see a gun constructed with proper materials. keep em coming!
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"ñøw mÿ šįg šüçkś!"
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Unread postAuthor: wyz2285 » Sat Mar 12, 2011 5:16 pm

Can you show me some of there videos ? I have chosen these pvc tubes because a friend of my build one using them and worked out very well.
Anyway I'm still looking for metal tubes so...
And these tubes aren't thin-walled, i think so, the wall has 5 mm, looks strong
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Unread postAuthor: jrrdw » Sun Mar 13, 2011 1:17 pm

If you used ' Krylon Fusion' or a 'adhesion promoter' the paint will stick good. If not it will start flaking off.
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Unread postAuthor: Labtecpower » Sun Mar 13, 2011 1:30 pm

[youtube]http://www.youtube.com/watch?v=36VQR-R0mFE&feature=related[/youtube]

This PVC is about as strong as yours, I think.
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Unread postAuthor: jakethebeast » Sun Mar 13, 2011 1:44 pm

i think that was white pvc...
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Unread postAuthor: Labtecpower » Sun Mar 13, 2011 2:00 pm

White pvc is exactly the same material as grey pvc (except from the color :roll:)
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Unread postAuthor: wyz2285 » Sun Mar 13, 2011 2:20 pm

Thanks for the video, looks painful :shock:
But I saw these two guns on youtube too, one of tem is made of a coke bottle, witch i think it´s worth than my pvc tubes. The other one is using the same type of pvc as I do and looks fine :roll:
1 video:
http://www.youtube.com/watch?v=8k2sv1vdUw8
2 video:
http://www.youtube.com/watch?v=biwaOZiNHhk
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Unread postAuthor: Gaderelguitarist » Tue Mar 15, 2011 11:31 am

I've had an end cap blow off like that before. Good thing I wasn't stupid enough to put the ignition source in it though :roll:

On paint, I've never had paint "flake" off of cannons before. I use Rustoleum professional enamel spray. It coats well and doesn't come off unless you actively try to remove it.
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so many muchness
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Unread postAuthor: motorfixer1 » Tue Mar 15, 2011 5:18 pm

Nice, clean looking launcher, still made out of plastic though.
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Unread postAuthor: mark.f » Tue Mar 15, 2011 6:18 pm

motorfixer1 wrote:Nice, clean looking launcher, still made out of plastic though.


So is this one. Oh, and this one. :wink:
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Unread postAuthor: Gun Freak » Tue Mar 15, 2011 6:34 pm

motorfixer1 wrote:still made out of plastic though.

Whats wrong with plastic?
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