My adv comb. NEWER UPDATE: full gun VIDEO

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.
uncomplientspud
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Wed Jun 04, 2008 9:40 pm

Linky for those who don't want to scroll down to the bottom

Well after the success of my first gun, i decided it was best to retire it for safety issues. On this one, it is using the same metering system as my first, and that is it. Chamber is 4220 cc with chamber fan. There are no holes drilled into the chamber wall, only through coupling and chamber. The barrels it will accept are 1.5" and 2" using threads. I put a handle on this one to make holding it easier. I then got the bright idea to put the sparker in the handle. Got it roughed in tonight and will make it formal tomorrow.

Note: I DID hose clamps for my tank however 6" were too small for me to use. I will be getting 7 or 8" clamps tomorrow

Please leave feed on what to improve on (not the tape though since that will be gone once i get the clamps)
Last edited by uncomplientspud on Thu Jun 12, 2008 5:19 pm, edited 3 times in total.
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hi
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Wed Jun 04, 2008 10:00 pm

my word lad, this is possible the finest work of art i have ever seen in my life. spectacular indeed.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Spuddin
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Wed Jun 04, 2008 11:18 pm

the grip looks like its gonna be comfy, good job. btw if u was gonna change anything i would get a cap to go on the end of the handle and drill a hole through it so the ignitor fits inside the handle length wise so its all nice and concealed.
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starman
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Wed Jun 04, 2008 11:36 pm

hi wrote:my word lad, this is possible the finest work of art i have ever seen in my life. spectacular indeed.
Uhhhh, no offense meant to the cannon shown here....but hi, perhaps you need to get out a little more often.... :roll:

Uncomplientspud, get us some updated pics once you finish the mods on this.
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mega_swordman
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Thu Jun 05, 2008 12:21 am

hi wrote:my word lad, this is possible the finest work of art i have ever seen in my life. spectacular indeed.
I'm having trouble deciphering the connotation of the post.

Regardless, I think this is a very nice gun. I personally though would like some more pictures from more angles, specifically showing off the propane meter.
"Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity." George S. Patton
uncomplientspud
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Thu Jun 05, 2008 6:03 am

i hope to pick up the longer hose clamps tonight, so i will be able to make everything look clean. The end cap idea sounds really good, not sure why i didn't think of that, thanks for that one spuddin. I will clean up the clamps and straighten out the wires today and post some pics for you guys
uncomplientspud
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Thu Jun 05, 2008 5:47 pm

alright, got some pics of the gun with the 10 foot barrel on it.

Image

and my personal fav
Image

here is the vid, sorry i didn't get it actually firing this time, the camera man had some problems with the camera. Read the description to understand what hole is what

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starman
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Thu Jun 05, 2008 7:37 pm

Whew, that's one long A barrel you've got there...can't help but get some good performance with that thing...and a beefy chamber pumping it too.

Try again to get us some shot vids, and some better close-ups of your handle and trigger mods.
uncomplientspud
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Fri Jun 06, 2008 4:16 pm

Here you go starman. I used some tape on the handle to help give it a cleaner look by taping over the wires (looks like a grip now as well)

Image

Here is how it is attached to the chamber, allows for refitting if i ever have the need
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Top view
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little abstract art here with the additional items in the shot. Pressure gauge fits in there snug and is really easy to read when filling
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Simply put tape over the front. If i ever have problems with the wires or sparker i can easily get to it.
Image

Scale shot with my hand, fits me really well, i like using it with this grip
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With the 2" barrel attached
Image

Still could not find a 7 " clamp at homedepo, gonna have to go to crappy tire this weekend
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starman
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Sat Jun 07, 2008 1:05 am

You can use a couple of smaller hose clamps connected end to end if you can't find one large enough.

I'm usually down on taped up stuff....most of which yours looks fair except the handle front "tape over"...doesn't cut it...see if you can come up with something else for that. Also, the taped on tank is unnecessarily ghetto looking.

I notice your meter valve handles are cattywompus to each other. You will find fuel metering easier to do if they both operate in the same direction.

Still though, not a bad effort. You've got a working advanced combustion under your belt....more than many can say.
Last edited by starman on Fri Jun 13, 2008 9:20 pm, edited 1 time in total.
uncomplientspud
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Sat Jun 07, 2008 5:24 pm

and the new video with it shooting and the damage

uncomplientspud
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Fri Jun 13, 2008 9:08 pm



vid of full gun firing with vid of entrance and exit hole
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Coodude26
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Mon Jul 28, 2008 3:20 pm

No need to double post the same thing. It looks very cluttered and overly complicated, and the barrel looks a couple feet too long. Even then you still need some sort of barrel support.
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TwitchTheAussie
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Mon Jul 28, 2008 6:43 pm

Jaesus Christ mate. Is it long enough for ya? :shock: All in all still bloody great mate :thumbright:
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