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d-sop
Guest
supppppppppppppp. does anybody have potato guns? pnumatic, combustion, etc? i just built one. its so awesome.
I built a hairspray one a couple years back, it was great. I heard the pneumatic ones are incredible.
mine is domination... pure butane, none of that b1tch ass hairspray shizz
got plans to make one??
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d-sop
Guest
i had hairspray cuz my friend was 2 cheap 2 buy axe and it gets all nasty around the ignitor. wat do u use 2 ignite? i use cheap bbq igniter
tazer ignition is the only way to go
![=[Stinky]=](/data/avatars/m/0/414.jpg?1000521489){kind=avatar}
Oh yes... I use PVC with Aquanet hairspray as the propellant. 5' 3" diameter PVC barrel glues into a 3" to 6" diameter cone, with a foot long 6" diameter combustion chamber. The end of the combustion chamber is threaded for a 6" pipe cap, with a gass grill ignitor epoxied to the end. Oh yeah. we're talkin 3-400 yards of glowing potato.
But unfortunatley I dont know what yer talking about, since they are illegal here in GA
But unfortunatley I dont know what yer talking about, since they are illegal here in GA
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d-sop
Guest
nice nice. my dads from ga. hairspray ****ed up myne i thnk so i wanna use some deorderant. i got a 3 foot barrel w/ 1'x3" barrel w/ bbq ignite.
Honestly, I don't think you should be anywhere near pressurized combustibles.d-sop said:
the best ignitor is butane by far I had a pvc one too with a grill ingnitor hooked into a pistol grip it was pretty sweet I even put sights on it
We built one and made a wooden carriage and wagon wheels for it...civil war style, yeah....and we make sure to shoot a ton of potatoes every July 4th. 
Buit a variation of a pneumatic potato gun for a senior design contest. Our team had to build a robot that played golf. I was responsible for building the long distance "driver". The gun had a turned aluminum barrel and a PVC pressure chamber. I was originally going to used a solenoid valve to fire it but after tearing one appart I made the whole pressure chamber into a pressure assisted valve. To actually fire the thing a valve was opened up to let air out of the back. This thing was super efficient and a menace to society. I used a small C02 bottle and a pressure regulator from a beer tap system. At 60psi I could lanch a golf ball 500 yards. At 70 psi the ear splitting boom noted the golf ball passing the sound barrier. At 100 psi I could shoot golf balls through plywood
The golf robot won the contest, even beating the course golf pro by a stroke. We were able to get the ball on the green the first shot almost every time. The cannon is stored away at the school somewhere but I have built a much larger version of it with a regular PVC barrel. But since my yard is only a half acre and I dont have a cO2 source anymore I havent really tested it yet
The golf robot won the contest, even beating the course golf pro by a stroke. We were able to get the ball on the green the first shot almost every time. The cannon is stored away at the school somewhere but I have built a much larger version of it with a regular PVC barrel. But since my yard is only a half acre and I dont have a cO2 source anymore I havent really tested it yet
Tired of potato guns. How about a Flamethrower?
Did you do anything to impart backspin on the ball? If you could hit a green from 500 yards, how could you have controlled the landing? Most well designed courses have traps or water in front of greens on par 5 holes, preventing the ball from rolling onto the green.Westy said:At 60psi I could lanch a golf ball 500 yards. At 70 psi the ear splitting boom noted the golf ball passing the sound barrier. At 100 psi I could shoot golf balls through plywood
The golf robot won the contest, even beating the course golf pro by a stroke. We were able to get the ball on the green the first shot almost every time. The cannon is stored away at the school somewhere but I have built a much larger version of it with a regular PVC barrel. But since my yard is only a half acre and I dont have a cO2 source anymore I havent really tested it yet
Interesting though.
When levelled properly and low winds the thing was extremely accurate and repeatable. Could easily put 5 balls in a 20 ft radius, the ground was very soft so there was little to no rolling. We also got lucky except for 1 out of 9 holes when the wind took the ball wide.Buck Fever said:
Here's my comment from the last time we talked about this:
Stinky,=[Stinky]= said:
That sounds like the one we built a couple of years ago. We can sit in our yard in WMA and lob taters across the river! Yeeeeee Ha!
The Cheese
Mine melted the other day. Well, it started to smell like the sweet burn of plastic. So we shoved some snow down the barrel to clean it out.
How does butance work? will it blow my cannon up? I have a 2 inch barel at 3 feet to a 3 inch chamber at 2 feet.
How does butance work? will it blow my cannon up? I have a 2 inch barel at 3 feet to a 3 inch chamber at 2 feet.
Did you trash the gun? I'd be scared to fire it if it's half melted...PVC shrapnel is baaad
We were quite worried about the ultimate tensile strength of PVC after repeated firings. Esp since it turns translucent orange when it goes in the dark. A friend feels that ABS is a stronger and safer plastic to use.blue said:Did you trash the gun? I'd be scared to fire it if it's half melted...PVC shrapnel is baaad
I also had a friend in HS who built a racketball gun but he was using oxy-acetylene torch fuel so he needed 1/2" steel. He shot one 2 miles. It had a ripple blast wave pattern melted into it when he found it. It was cool.
Plastic shrapnel is bad. I tried building a dual chamber potato gun, Essentially a regular gun with another one spliced about 3 foot down the barrel with the pressure chamber off at 90 degrees. The thing blew up on the first firing. I figure I had two pressure waves collide making one big bang. Luckily the thing was soo long I had to support it in the middle by turning a patio table on its side and balancing the middle of the gun on the table. There was pieces of plastic stuck into the deck and the table. I walked away with ringing ears.blue said:Did you trash the gun? I'd be scared to fire it if it's half melted...PVC shrapnel is baaad
Barbaton said:
This is an awesome fact. If you peel them, and shoot them at night, they glow... Kinda like tracers. its great. We experimented with hollowing out the end of a potato, and spraying starter fluid into it. Try it.... They make a huge boom, and the gun turns yellow and the glowing orange potato soars into the night..... Wouldnt reccomend doing it often tho
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d-sop
Guest
that's what my mom thinks. im so safe w/ it i swear. i just use axe now. works like a charm, delivering a sonic boom to the 3 kids that live behind mequadricolour said:
meh, that kid was pretty competent and knew what he was doing. I think he has a physics degree now. on the other hand, my other friend who was making dry ice bombs in glass bottles and had one blow up in his hand in front of his face. Got glass in his nose, forehead, cheek, but not his eye. lucky ****H8R said:
nope. acetylene is C2H2, with a triple bond between the C's, and hence has a lot of energy so it's a good building block for other chemicals.mack said:
butane is C4H10, all single bonded. Acetylene is how the germans ran the war, making gasoline, etc from it, since there aren't too many oil wells in Germany, or so an old chem boss told me...
can you guess who's studying Orgo for the MCATs?
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d-sop
Guest
thats hella big words. too many for me. im in intro to chem/phys.Barbaton said:nope. acetylene is C2H2, with a triple bond between the C's, and hence has a lot of energy so it's a good building block for other chemicals.
butane is C4H10, all single bonded. Acetylene is how the germans ran the war, making gasoline, etc from it, since there aren't too many oil wells in Germany, or so an old chem boss told me...
can you guess who's studying Orgo for the MCATs?
d-sop said:
you'll get to that stuff eventually. chem is cool. i kinda wish i'd stuck with it. i made lidocaine and aspirin and banana flavoring in class the other day...
Back in the day when beer cans with pop tops were made like soup cans with a crimped top and bottom we used to make cannons from them. The magic number was 7 cans. Cut the top and bottom of six, the seventh had a couple of extra punches in the top with a can opener and a hole punched in the center of the bottom all were duct taped together. Add a squirt of lighter fluid in the bottom hole and swing the thing up and down to mix air with the fuel. Then touch off the carb hole with a lighter or hold in a campfire...Boom!! It would shoot a burning tennis ball (soaked in lighter fluid of course!) about 100 ft into the air. It was hell trying to put out the neighbors hedges when the burning ball bounced into them. 
neaky:
This could be reproduced with small Campbells soup cans today. Just use a "broth" can for the seventh so you can pour out the contents easily. Bigger is not better, my brother-in-law tried to make one out of large tomato juice cans once and didn't get more than a "foomp" out of it.
Mike
neaky: This could be reproduced with small Campbells soup cans today. Just use a "broth" can for the seventh so you can pour out the contents easily. Bigger is not better, my brother-in-law tried to make one out of large tomato juice cans once and didn't get more than a "foomp" out of it.
Mike
Put a screen on it and you have fry's
I dunno, O/A is just simply not to be f***ed with.chicodude01 said:
Acetylene is very unstable. At delivery pressures higher than 15 psi it can spontaneously combust.
Add oxygen to this and you have a flame hot enough to melt mild steel quite easily.
And that balloon trick? I've heard of that. A dude in my welding class sent himself to the hospital with that trick. Just a tad too much and you will blow out people's windows for half a block. He did it once and was too close, luckily his back was turned when it exploded and there was a friend there to drive him to the emergency room.
They had to replace 10 different windows in the buildings next door.
We used to do the O/A thing in shop class just to show people how dangerous it was. Kinda ironic.
On to my potato gun though. Back in high school physics class me and a couple buddies built a Propane/Oxygen Potato gun. It used an old lawn mower capacitor, six C cell batteries, and a spark plug for the ignitor.
On to my potato gun though. Back in high school physics class me and a couple buddies built a Propane/Oxygen Potato gun. It used an old lawn mower capacitor, six C cell batteries, and a spark plug for the ignitor.
This thread is just cool! blowing things up, flaming potatoes, flamethrowers.
good stuff
good stuff
speaking of Fun + Dangerous
Thermite
that's Fun + Dangerous
:devil:
Thermite
that's Fun + Dangerous
:devil:
