Supersonic?

Harness the power of precision mixtures of pressurized flammable vapor. Safety first! These are advanced potato guns - not for the beginner.
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noname
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Sat Jun 02, 2007 8:43 pm

Well, I've been trying different types of high pressure burst discs lately. My gun stopped working as a hybrid, no idea why. I have my meter length and pressure set correctly according to SpudTool (AdvancedSpuds) and FuelTool (BurntLatke). It's all steel, so I've been shooting it at ridiculous pressures as a pneumatic. I used two layers of aluminum soda can today, as a burst disc. They held 350 psi! I couldn't pump further with my bike pump (I was literally jumping on it), so I waited. After a minute or two, the thing went off, totally randomly. The steel ball bearing went through 6 soda cans, two layers of 1/2" plywood (the backstop :lol: ), through my tin shed, out the other side, and finally left a 1/2" deep dent in my 3/4" plywood fence. It was extremely loud, louder than anything I've ever heard. Usually the gun sounds like a rifle, but this shot was louder than a shotgun. I can barely hear now.
Give me your opinion, was it supersonic or not.

Almost forgot, this gun's barrel is 10 feet of 1/2" PVC for those who don't know.
Attachments
The burst was PERFECT!
The burst was PERFECT!
Both layers on top of each other
Both layers on top of each other
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pyromaniac
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Sat Jun 02, 2007 8:45 pm

i say hell yeah is was. horay for a sale at OSH.
:pottytrain3:
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hi
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Sat Jun 02, 2007 8:58 pm

sorry, but i say nay.

http://www.spudfiles.com/spudtech_archi ... hp?t=15584
"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

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Redcoat
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Sat Jun 02, 2007 9:04 pm

wow :shock: . thats is a massive! It went through all that?

Thats AWESOME!
Poo.
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SpudBlaster15
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Sat Jun 02, 2007 9:06 pm

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Last edited by SpudBlaster15 on Wed Jul 14, 2021 3:52 pm, edited 1 time in total.
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spudthug
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Sat Jun 02, 2007 9:42 pm

i almost got supersonic with my jme-45 gun...i got 1054 fps with a 1 inch marble....at 100 psi...if i went to 120 there is no doubt i would have gotten supersonic..

sadly my compressor wont fill the massive gun over 105 psi..
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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VH_man
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Sat Jun 02, 2007 9:58 pm

wow.................... that sounds pretty powerful. i would invest in a shock pump and send things at the speed of sound with simple pneumatic pressure, and prove that it can be done............
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SpudBlaster15
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Sat Jun 02, 2007 10:10 pm

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.
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noname
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Sat Jun 02, 2007 10:16 pm

I'll keep trying, as soon as I can get it to work as a hybrid. 6 or 7x will produce enough pressure to get it going that fast. Over the summer, I also plan on doing hybrid C:B ratio tests, with a 40 or 50 foot barrel, and replicating Latke's tests (cutting 20% off after ever round of shots).
I plan on starting with a 50 foot barrel, shooting 3 shots at 1x, 3 shots at 2x, 3 shots at 4x, 3 shots at 5x, then cutting off 20%. I'll keep doing this until I get to a 1 foot barrel.
Damn, I'm gonna go through soooo many burst discs. :?

Oh, forgot to mention, check out that amazing burst!
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spudthug
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Sat Jun 02, 2007 10:19 pm

my marble was 10 grams...idk i didnt come up with it ggdt did...but anyway..no name u say that u only put 350 psi of air in there? wow...try a 5x mix and u could probably get around 1000 fps...im not a hybrid expert but isnt it pretty easy to reach 350 psi with a hybrid?
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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PVC Arsenal 17
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Sat Jun 02, 2007 10:20 pm

That sounds like one hell of a shot! Lucky that shit didn't bounce off something and fuck you up.

Burst disc guns continue to fascinate me. I have yet to see any valve match the speed of burst discs. The only trouble is finding the perfect one for your gun.
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noname
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Sat Jun 02, 2007 10:27 pm

By sticking on a peak pressure guage, I figured (when it worked as a hybrid) 1x would get me about 90 psi, 1.5x would give about 140 psi, 2x would get me about 170, 2.5x got around 215, 3x about 250, 4x about 310, and I didn't test past that.
I wouldn't recommend using soda can burst discs for PVC guns, because one layer takes around 170 psi to burst.
PVC Arsenal, I got hit by one of the bearings once. At a 2.25x mix, the ball bearing got shot through 4 soda cans and hit a piece of steel pipe that was lying around. It gave the pipe a 1/4" deep dent, bounced back, and tapped me on the kneecap.
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spudthug
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Sat Jun 02, 2007 11:01 pm

@noname: what is the best burst disk u have used at a 4x mix? also waht mix are milk bottles good for?

also does anyone know how to wire up a stun gun to 2 spark plugs?? i will be posting a thread asking this question soon reply there..
4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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A-98
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Sat Jun 02, 2007 11:11 pm

hm.... i need to build a hybrid.....badley....

also....

spudthug.

i

cannot

allow

you

to have an avatar cooler than mine....

i marvel in the presence of your avatar.
There are rules, and then there are hundred dollar bills.
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Velocity
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Sat Jun 02, 2007 11:14 pm

I elaborated on the gangsta theme....

anyways...

PVC Arsenal, I doubt that there IS a valve faster than a burst disk. Full flow, rapid opening... can't beat it.

The only valve better than a burst disk valve... is a BIGGER burst disk valve.
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