Latest Combustion Project

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
DEATHSTAR
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Posts: 20
Joined: Tue Apr 03, 2012 5:30 pm

Thu Apr 05, 2012 11:33 am

Hello all,
Just wanted to run my latest Combustion project specs by you guys for any feedback/
advice (That I greatly appreciate). :

-I have a three foot brass pipe for barrel with about .625" ID (IIRC) ,it's about .75" OD. Fits a red color "Ideal" wire-nut perfectly.
(These will be the ammo, as well as a few will have nuts/bolts added to tip for weight).

-The Chamber is a Chrome plated, Stainless Steel, drink mixer thing (for bars) it's about 12 or 14 ounces. I liked it because it's thick, and the top is removeable, for adding the computer fan. It will be epoxied and /or have hose clamps around it.

-The Brass barrel was originally a wall rack thing, so I'm planning to use one of the brass mounts to convert into a bolt handle. It will be Bolt-action loaded, through a hole(slot) in the barrel , and I'll probably attach copper for the sleeve. It'll simply slide and fit into a notch in a steel plate I'll attach to the stock.

-The stock will be Oak probably, and run the length of the barrel.
Fancy , I might buy a brass door kick-plate to cut into little accents on the stock. Planning on using a small size propane tank for fueling this thing,
it will fit in a slot in the butt-stock part.

-Fueling will be through a metering pipe, was planning on about 5% volume gas of propane(???) And I wanted to use: copper pipe , stright off the propane tip, a blow nozzle, into chamber. (For compactness).
There used to be Propane tips sold on link from here , but can't find it???
Perhaps I'll have to use the tip off a torch, but that's little expensive?

-Ignition used will be a battery powered BBQ grill ignitor, it's a fancy one that sparks repeatedly. (I have a few of these but once they're gone I'll check out Hotwired's stunguns post here , since I have like 60+ cameras)(reason I joined)

-Venting will be a computer fan. I was interested in an externally mounted motor, with shaft though a bushing, fan blades inside...but I have some computer fans anyway.

-I'll be sure and post pics once it's finished, then it'll be a gift for a best friend. (He lives in the country , so it's fun to shoot there).

Well, been lurking, studying a bit, and I've built a few other "spud" projects, just not so many combustions.
I built one for testing out of an aluminum bottle thing, and a long-neck lighter JB welded in, IT was a real BANG!
(with duct-tape over the top),
NO metering pipe either, and it shot a blowgun dart what seemed like "supersonic" through FOUR sides plastic recycle bins!
So I've been interested in this "toy" since.
So Thanks for any feedback/suggestions! :D
EDIT: srry for the length of this, I'm home, sick today...hate that, I'm never sick. :(
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Brian the brain
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Thu Apr 05, 2012 1:31 pm

can't wait to see it.
Oak and brass..just my thing!!
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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