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HD Combustion Cannon!

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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HD Combustion Cannon!

Unread postAuthor: scottcrete » Sat Apr 05, 2008 3:02 pm

[youtube]http://www.youtube.com/watch?v=qr3FOC5pE2s[/youtube]

That video i just made will show you youngsters how to build a cheap combustion cannon.. i made this one for 30.00 today for my father n law..

what do you think?


Check out the video.. then look at these pics after i painted it..
My father n law really likes harleys and i am making this one for his birthday.. i didnt have much money to spend on it.. so here are the pics.. let me know what you think..

Image

after painting
Image

after painting

Image

Image

jims gun with decals installed (not completed though)

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more decals.. notice the top of the gun

Image

last pic of decals installed to this point.. let me know what you think...
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Last edited by scottcrete on Mon Apr 07, 2008 7:38 am, edited 2 times in total.
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Unread postAuthor: windshrike » Sat Apr 05, 2008 3:05 pm

It says its 'no longer available'. The video, I mean.


EDIT: Whoops, its back now.

I like it, the only problem I foresee are that people inept enough to need a tutorial probably won't solvent-weld it unless thats shoved in their faces.
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Last edited by windshrike on Sat Apr 05, 2008 3:13 pm, edited 1 time in total.
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Unread postAuthor: SpudFarm » Sat Apr 05, 2008 3:10 pm

now THAT makes me want to make a big bore combustion!
two things stopping me tho
1) i put $1200 in my hybrid
2) i can't get pressure rated PVC... :roll:
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Unread postAuthor: OuchProgramme » Sat Apr 05, 2008 3:13 pm

30$???

Wow.
Thats expensive...for a cheap combustion.
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Unread postAuthor: scottcrete » Sat Apr 05, 2008 3:18 pm

not for a safe one that wont kill you
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Unread postAuthor: Hubb » Sat Apr 05, 2008 3:18 pm

How the hell do you spend $1200 on a hybrid? I can see spending $30 on a cheap combustion, but that is a lot of money on a hybrid. Did you build the thing out of platinum laced with diamonds or something?
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Unread postAuthor: MrCrowley » Sat Apr 05, 2008 3:41 pm

That 4" pipe looks pressure rated, I guarantee it wont explode unless it's been damaged in some way. Those couplers cost about $8 each don't they?
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Unread postAuthor: TurboSuper » Sat Apr 05, 2008 3:42 pm

Cool tutorial.

I always have a bit of a problem with mounting the piezo sparker in the back like that, especially if you're going out of your way to reinforce the chamber with couplers. The reasoning for this is that threaded cleanout adapaters are generally weak, and drilling a large hole through them doesn't do much to help. Also, if you set the gun down on it's back...watch out :shock:

And I agree with Crowley, pressure rated pipe negates almost all safety concerns in this case. I can't tell if it really was PW since the pressure rated stuff is gray here.
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Unread postAuthor: scottcrete » Sat Apr 05, 2008 3:45 pm

yeah but my concern is it exploding against your stomach.. and cutting you in have with little shards of plastic.. i would rather it blow my hand off.. than kill me .. would you not?
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Unread postAuthor: Davidvaini » Sat Apr 05, 2008 3:51 pm

spudfarm wrote:1) i put $1200 in my hybrid


gold plated hybrids with accented diamonds FTW!
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Unread postAuthor: TurboSuper » Sat Apr 05, 2008 3:51 pm

scottcrete wrote:yeah but my concern is it exploding against your stomach.. and cutting you in have with little shards of plastic.. i would rather it blow my hand off.. than kill me .. would you not?


I agree 100%...but wouldn't you rather have that extra safety, AND not have to worry about losing a hand/eye by repositioning the igniter?

Was the pipe pressure-rated? If so it wouldn't expolde anyways unless you loaded it with guncotton or some such....
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Unread postAuthor: MrCrowley » Sat Apr 05, 2008 3:53 pm

I've had two explosions right next to me at 110 PSI, one was next to my head, the other my crotch, pelvic area.

With only boardshorts (very thin) on, the PVC didn't do anything.
And the one against my head was lightly scratched by a piece of PVC.
Mind you that could take out an eye.

Sure the chamber wasn't right up against me, but it would never blow of your hand. At most you could have your finger half taken off, or a artery cut open.

IMO, even if that pipe isn't rated, at 30-45PSI (hairspray) it wont blow up.

I'm just trying to say that the couplers weren't necessary for someone who may build the same cannon from your video, $30 on a basic combustion is quite a bit in America.
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Unread postAuthor: scottcrete » Sat Apr 05, 2008 3:57 pm

those couplers are 1.57 at lowes each

MERGED:

pressure rate to 480psi
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Unread postAuthor: MrCrowley » Sat Apr 05, 2008 4:03 pm

Wow they're pretty cheap.

How come it cost $30 then?

Edit: I'm sure I told you about the posting rules and double posting?
Anyway you may want to read <A HREF="http://www.spudfiles.com/forums/viewtopic,p,136508.html#136508">This</a> to learn all the posting rules. We don't allow double posting, even if it is a seperate response, it clutters the forum too much. Just edit your posts instead.

Thanks. :)
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Unread postAuthor: scottcrete » Sat Apr 05, 2008 4:07 pm

okay..thanks
my bad.. just stating. i dont want my guts blown out for a simple toy gun
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