1st combustion cannon

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.
Philbob1
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Mon Jun 09, 2008 6:13 pm

I have nothing to do at the moment, so I felt like posting videos (not havin' pics yet XD) of the 1st spudgun my friends and I built a few months ago.
Classic.
Clean.
Makes a huge roar when getting ignited. Igniting 1st try about half of the time.
Propane powered.
Longest shoot at about 200m.
Average around 180m.
Takes about 13s when shooted straitght up to land back.
C:B : about 0.8
I am not the guy in that movie, and for your info it's potato vs concrete.
[youtube][/youtube]
(it's french in it, and I know the cam is sucky.)
EDIT: Video should work now, new to youtube uploading.
Last edited by Philbob1 on Mon Jun 09, 2008 6:26 pm, edited 2 times in total.
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starman
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Mon Jun 09, 2008 6:16 pm

Philbob1 wrote:(magic recipy for making spray and pray work half of the time, but with alot of gas spilled, fill the chamber with fuel until you see it coming out then vent it out with your hands about 15s :P works like charm)
OK first off, this made no sense whatsoever.

Second, your Youtube video isn't working.
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STHORNE
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Mon Jun 09, 2008 6:20 pm

lol, troubles with the vid?

@starman
yeah dude, yet another person who doesn't believe in sensible vocabulary/punctuation :? eh? lol
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Philbob1
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Mon Jun 09, 2008 6:21 pm

I've fixed the vid, should techincally work.
STHORNE wrote: @starman
yeah dude, yet another person who doesn't believe in sensible vocabulary/punctuation :? eh? lol
Sorry, it is hard sometimes to translate from french to english :P
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STHORNE
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Mon Jun 09, 2008 6:22 pm

lol, sorry to come off "harsh" but I didn't know you were translating lol.

Apologies :( :wink:
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Philbob1
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Mon Jun 09, 2008 6:25 pm

STHORNE wrote: Apologies :( :wink:
Apologies accepted, any feedback if the vid is working or not?
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starman
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Mon Jun 09, 2008 6:43 pm

Looks like the concrete won!..:roll: And yes, that was some nice shot blast reverberation there...I love it!
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STHORNE
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Mon Jun 09, 2008 6:49 pm

poor potato (lol)...never had a chance against that concrete :lol:

mind posting some pics of the gun itself?
looks pretty good (from what I can tell) for your 1st.
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Philbob1
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Mon Jun 09, 2008 7:15 pm

Sadly I do not have the gun with me, the only thing i can give as would be other vids.

(uploading it atm, will take a bit of time)

But I can tell that its ignition system is a classic piezo placed at the back, on a screw cap (idk if i have that right).

4'' large 1' long chamber, 2'' large 5' long barrel.
All in ABS.
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