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LogicaL Chaos
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Potato Launchers/Potato Cannons
#26658038 - 05/08/20 06:06 PM (3 years, 8 months ago) |
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Ever built a Potato Launcher/Cannon before? If so, what pipe material, design and fuel/propellant did you like the best?
-------------------- "What you must understand is that your physical dimension affects everyone in the higher dimensions as well. All things are interconnected. All things are One. Therefore, if one dimension is broken or out of balance, then all other dimensions will experience repercussions." - Pleiadian Prophecy 2020 The New Golden Age by James Carwin PROJECT BLUE BOOK ANALYSIS! (312 pages!) | Psychedelics & UFOs | Ready to Contact UFOs? | The Source on Mushrooms | Trippy Gematrix | Dj TeknoLogical | Fentanyl Test Kits R.I.P. Big Worm || The Start of the Ascension Process was 2020. Welcome to the Next Great Era of Earth 🌎🌍🌏
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Fotosonik
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26658264 - 05/08/20 07:30 PM (3 years, 8 months ago) |
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My brother built a pretty cool one a while back. It was a couple different sizes of aluminum pipe welded together. A larger combustion chamber that led to a barrel. A hole was drilled into the combustion chamber on the side with a spark plug/coil/ button system for ignition. There was a threaded cap on the back that we’d spray fuel into. It was a bit involved but extremely powerful. Boatyard Alaska project.
Also hello Shroomery, my first post!
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: Fotosonik]
#26658270 - 05/08/20 07:32 PM (3 years, 8 months ago) |
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Epic first post! Wow! What a cool creation. I love to see a pic of that if there was one.
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COPain
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26658304 - 05/08/20 07:42 PM (3 years, 8 months ago) |
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I've heard, you use 3 or 4" ABS (PVC is brittle) about 24"+/- a reducer to 2" about 4' long. On the 3 or 4", use a glue on threaded clean out cap. Use a Flint style lantern lighter. sparks on the inside with a twist. The 2" end, file down to a sharp tapered edge to cut the potato as you jam it in. Starter fluid works well as a propellant. FYI the bigger the chamber the lager the boom. Good for 2-300 ft. That's what heard because things that explode are DANGEROUS.
Edited by COPain (05/09/20 02:17 AM)
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: COPain] 1
#26662068 - 05/10/20 10:23 AM (3 years, 8 months ago) |
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Use propane. Pvc is fine. 300 feet is short distance if done right. Use something that makes an electric spark. Make at least 3 spark gaps, at the back middle and front of the chamber
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26662106 - 05/10/20 10:49 AM (3 years, 8 months ago) |
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I find that PVC glue caused leaks after a couple uses so I stopped using PVC. ABS was airtight the whole way thru and is my preferred material.
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26662110 - 05/10/20 10:51 AM (3 years, 8 months ago) |
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Pvc joints should never leak if made correctly. It literally melts the polymer together
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta] 1
#26662117 - 05/10/20 10:53 AM (3 years, 8 months ago) |
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Do not use cellular core pvc though.
The chamber pressures created are under 100 psi. And those are short bursts. Abs is probably safer during a failure but even exploding pvc isn't going to hurt you unless it gets in your eyes
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26662120 - 05/10/20 10:54 AM (3 years, 8 months ago) |
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Yeah, when I made the PVC cannon, the glue had a "honeycomb" structure at the joints that leaked over time from use. I did also spray paint over it with matte Military green, perhaps that was my issue.
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26662129 - 05/10/20 10:58 AM (3 years, 8 months ago) |
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Nah paint don't matter. Read up on proper pvc jointing. The joints should be stronger than the rest of the installation
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26662135 - 05/10/20 11:02 AM (3 years, 8 months ago) |
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Alright will do. I guessing primer is involved (i didnt use primer).
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26662150 - 05/10/20 11:08 AM (3 years, 8 months ago) |
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Yes primer is necessary
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26662154 - 05/10/20 11:10 AM (3 years, 8 months ago) |
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Do u use more glue than typical? And does the primer help with preventing the honeycomb issue?
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bodhisatta 
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Too much glue can be bad too as both primer and glue soften pvc. You should just do it right. White PVC requires primer to soften the surface enough for the glue to work well. It's not really glue though its cement.
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26662168 - 05/10/20 11:16 AM (3 years, 8 months ago) |
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Right. Excellent info. U ever spray paint them afterwords?
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26662171 - 05/10/20 11:16 AM (3 years, 8 months ago) |
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A long time ago i did one with paint. The krylon for plastic works good
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26662175 - 05/10/20 11:17 AM (3 years, 8 months ago) |
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Oh nice! I just bought some Krylon for a jetski paint job Im working on.
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PrimeMulch
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#26885155 - 08/17/20 03:36 PM (3 years, 5 months ago) |
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Yes. Yes I have. Using cocoa shea butter spray as the propellant. Also remember that the closer the projectile is to the combustion chamber, the less likely it will go kabloue in your face. Wait 24 hours for the glue to dry. It can go kabloowie before then (if you try to fire).
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: PrimeMulch] 1
#26885178 - 08/17/20 03:50 PM (3 years, 5 months ago) |
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I like to use it like 60m after the glue dries. The glue fumes usually give you a couple good booms.

PROtip Graphite the fuck out of the clean out plug.
Somewhere between 225 and 300 fps potatos depending on propane vs MAPP
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PrimeMulch
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta] 1
#26888954 - 08/19/20 06:17 PM (3 years, 5 months ago) |
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I don't know if it's an urban legend but I have heard "If you shoot a pvc potato launcher before the glue has had 24 hours to dry you risk the chamber blowing up".
I do like the tip of graphiting the plug. Very cool.
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: PrimeMulch]
#26889130 - 08/19/20 08:30 PM (3 years, 5 months ago) |
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Pvc is a solvent weld. The shits 90% after a few minutes. A couple hours its 99%. The psi from a shot is <20. Though its an explosion but I guess if you want to be super safe wait a day
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Asante
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta] 1
#26891236 - 08/21/20 08:03 AM (3 years, 5 months ago) |
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Meanwhile in rural Holland
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: Asante]
#26912130 - 09/01/20 02:39 PM (3 years, 4 months ago) |
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Now thats A Potato Cannon! 
Reminds me of a Pumpkin Cannon competition show Ive seen on TV. Those things are freakin HUGE!
Bodhi, when I made a PVC cannon, the glue kept giving me a Swiss Cheese effect which would cause leaks. I even used primer. Which is why i trust ABS Cannons more.
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bodhisatta 
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Sounds like something went extremely wrong
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26912224 - 09/01/20 03:35 PM (3 years, 4 months ago) |
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Maybe i didnt cure it long enough? It happened with two different PVC cannons I made....
I never had that issue with ABS.
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bodhisatta 
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Even 1/2" pvc is so thick if you're getting swiss cheese you probably used the wrong chemical entirely or something. Ive never seen or heard of that happening with pvc.
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#26944156 - 09/19/20 01:20 PM (3 years, 4 months ago) |
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I used the blue PVC cement so I dunno know 
Found this gif meme, had to post 
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Sugabearcrisp
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27121586 - 01/02/21 06:25 AM (3 years, 26 days ago) |
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I agree with bod, pvc solvent welding should be air tight and stay that way.
We used ether starter spray and a piezo electric grill starter.
This is what you should be using.
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: Sugabearcrisp] 1
#27121614 - 01/02/21 06:54 AM (3 years, 26 days ago) |
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Best propellant by far is 50/50 90%iso and gasoline. You can only go with about 3/4 capful(iso cap). Roll with half cap or sometimes you'll have to open and add fresh air to fire. Be careful this propellant can blow plastic apart. But oh man I loves me a good potato gun. I got a 6'er and a 3'er. Jam paper in like shotgun wad and throw a handful of paintballs in, boom paintball shotgun. Use nails and shoot a enemies dirt road, lol. My good friend used to sit in bushes outside his house and shoot Indian casino security with lemons. The tighter the fit the crazier they would fly. He was a crazy dude. Ohh and make sure to use ABS glue with ABS, PVC glue will eventually blow off and hit you in knee. One of the funniest things I have ever seen. Careful out there.
--------------------
PFC x Creeper Lets Get Stoned
Edited by MycoBrainz (01/02/21 06:56 AM)
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27121616 - 01/02/21 06:56 AM (3 years, 26 days ago) |
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That's a ridiculous propellant. Use butane or propane. There is no way to atomize liquid fuels appropriately for combustion. You're relying on the vapor produced
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Sugabearcrisp
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27121625 - 01/02/21 07:07 AM (3 years, 26 days ago) |
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That is why we use the ether based aerosol starter fluid. A quick shot is all you need. I am sure butane or propane works equally well but requires more skill to load.
One thing to be aware of is that you may start a potato patch inadvertently. For years we would shoot them into the marshy area behind my FIL's house (holiday tradition), after a while he noticed that he had potato plants growing.
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stubb
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27121691 - 01/02/21 08:21 AM (3 years, 26 days ago) |
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Build a pneumatic cannon in the mid '90s, it's still kicking around somewhere in storage. I got the barrel from this potato cannon enthusiast who built a machine that cut rifling into 2" PVC.
Oh shit, the dude's (spudtech) still in business! I remember being super impressed with his stainless bolt-action cannon:
--------------------
🆃🄴🅰🄼 🅲🄻🅸🄽🅶🅆🆁🄰🅿 You wake up. The room is spinning very gently round your head. Or at least it would be if you could see it which you can't. It is pitch black. > TURN ON LIGHT
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: Sugabearcrisp] 1
#27121813 - 01/02/21 10:37 AM (3 years, 26 days ago) |
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Quote:
Sugabearcrisp said: That is why we use the ether based aerosol starter fluid. A quick shot is all you need. I am sure butane or propane works equally well but requires more skill to load.
One thing to be aware of is that you may start a potato patch inadvertently. For years we would shoot them into the marshy area behind my FIL's house (holiday tradition), after a while he noticed that he had potato plants growing.
I use a metering device. There's calculators online. It's pretty easy to rig propane or mapp. Consistent boom every time
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27122054 - 01/02/21 12:55 PM (3 years, 26 days ago) |
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Damn, thats high tech! I should look into those metering devices 
Sugabear, I never used the clear stuff. Perhaps thats why my blue PVC cement went swiss cheese on me
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migraineur
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27122837 - 01/02/21 08:51 PM (3 years, 25 days ago) |
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The one I built decades ago was made with reinforced PVC. Do not use standard PVC.
I also used some PVC glue that plumbers use as well as a BBQ igniter and some wires which allowed me to hold the igniter. I had a hole drilled into the barrel where the wires went. I think I might used something else that was hard and glued in to keep the ignition wires in place within the barrel.
If you make one from PVC then it's worthwhile replacing it after about a year of use because of safety reasons. I was ready to throw mine out for this reason but thought I'd give it one more shot before I did and the back of the PVC cap blew off and hit the house like some kind of deadly frisbee. The thread of the cap was still on but the rest of it the cap was the part that blew off.
Also, I found that Lynx/Axe body spray worked really well as a fuel source. Aerostart worked well too but I hated the smell of it.
Oh, I filed the end of my barrel which made it easier to shove potatoes and onions down it.
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27125822 - 01/04/21 10:51 AM (3 years, 24 days ago) |
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Quote:
bodhisatta said: That's a ridiculous propellant. Use butane or propane. There is no way to atomize liquid fuels appropriately for combustion. You're relying on the vapor produced
I bet if you try it you'll never use the weak ass butane or propane, besides how do you get an accurate measurement that's not a pain in the ass? I've tried everything that burns. And yes gasoline vapor is explosive as Eff. My ignition device was a BBQ lighter wired to 2 screws, put in at angle. Adjust gap for biggest spark.
--------------------
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27125846 - 01/04/21 11:02 AM (3 years, 24 days ago) |
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Thats wild man! I saw that u prefer ABS 
How did u "inject" the iso/gasoline fuel mixture into the chamber?
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27126079 - 01/04/21 12:32 PM (3 years, 24 days ago) |
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I just roughly mixed gas into half full bottle of iso. Then just filled iso cap half full and dumped it in. If you take too long you'll get vapor lock. To fix just open and lightly fan in some air. If your fast you can get a big blast from 3/4 capfull. It's probably like 2-5ml max. The best is getting the smallest 711 cup, tear sides like a shotgun wad, barely crease bottom edge of cup to fit into 2.5"abs, carefully take ramrod(broom handle) and seat in bottom of barrel, add whatever projectiles you prefer(rocks, nails,paintballs, carbide, crashed glass, etc.) Fire at will. Nails work good for casino parking lot.
--------------------
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27126117 - 01/04/21 12:47 PM (3 years, 24 days ago) |
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Damn, thats pretty wild! So you just pour it directly onto the ABS pipe chamber? Does the gasoline eat away at the ABS at all?
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27126150 - 01/04/21 01:06 PM (3 years, 24 days ago) |
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Quote:
MycoBrainz said:
Quote:
bodhisatta said: That's a ridiculous propellant. Use butane or propane. There is no way to atomize liquid fuels appropriately for combustion. You're relying on the vapor produced
I bet if you try it you'll never use the weak ass butane or propane, besides how do you get an accurate measurement that's not a pain in the ass? I've tried everything that burns. And yes gasoline vapor is explosive as Eff. My ignition device was a BBQ lighter wired to 2 screws, put in at angle. Adjust gap for biggest spark.
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27127837 - 01/05/21 09:41 AM (3 years, 23 days ago) |
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Quote:
LogicaL Chaos said: Damn, thats pretty wild! So you just pour it directly onto the ABS pipe chamber? Does the gasoline eat away at the ABS at all?
Maybe but as long as you use abs and abs glue it should be fine. The only failure we ever had was when using pvc glue on abs(it wasn't me) but it took a few hundred shots. It just came apart at joint. We cleaned sanded applied proper glue and the pot launcher is like 12years old. I have never worried about the gas degradation to the ABS. I have about a dozen different pot guns. We used to play paintball with them, they hurt. I dunno what Bods talking about atomizing fuels, it's not an internal combustion engine. Who knows? Maybe Bods got a fuel injected potato gun. It's got an extra 100HP and it only makes left turns.
--------------------
PFC x Creeper Lets Get Stoned
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27127965 - 01/05/21 11:06 AM (3 years, 23 days ago) |
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You need vapors in the chamber. Liquids make some vapor but they're retarded fuels for a potato gun, unless you could atomize them. Gasoline is extremely retarded.
Propane is the easiest and most reliable. And there's a way to measure it so you get the best boom possible every single time you click the ignitor.
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128730 - 01/05/21 04:53 PM (3 years, 23 days ago) |
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Quote:
bodhisatta said: You need vapors in the chamber. Liquids make some vapor but they're retarded fuels for a potato gun, unless you could atomize them. Gasoline is extremely retarded.
Propane is the easiest and most reliable. And there's a way to measure it so you get the best boom possible every single time you click the ignitor.
All Opinion. How do you measure the proper amount of propane? Gasoline has no intelligence btw.
--------------------
PFC x Creeper Lets Get Stoned
Edited by MycoBrainz (01/05/21 04:54 PM)
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27128761 - 01/05/21 05:04 PM (3 years, 23 days ago) |
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The easiest way is two ball valves and a lenth of pipe between that's calculated out to make the perfect stoichiometric air to fuel ratio for combustion.
I put a schrader valve on the cannon and made a device that meteres out the propane or mapp and has a chuck that fits the valve on the gun. Some people attach the propane tank right to the gun with zip ties or large worm drive hose clamps.
Propane has slightly lower energy density than gas but due to inefficiency in atomization of gasoline fuel propane powered vehicles and other engines get better efficiency.
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128767 - 01/05/21 05:07 PM (3 years, 23 days ago) |
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128787 - 01/05/21 05:12 PM (3 years, 23 days ago) |
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Looks like way too much BS for a potato gun. I'll stick with gas and iso, I get better range than all the different fuels we tried. That's just not practical for potato paintball. But I do like the engineering of it.
--------------------
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27128797 - 01/05/21 05:16 PM (3 years, 23 days ago) |
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Ive been making potato guns for almost two decades now. You won't achieve greater distance or velocity with anything other that measured fuel. Using sprayed in propellants almost always give combustion that's too rich. You'll notice you get residues and colored exhaust gas and even carbon deposits using lighter fluid, alcohol, hairspray etc..
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128805 - 01/05/21 05:18 PM (3 years, 23 days ago) |
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Youd think for potatoe paintball you'd want fast reloading. You can make a breechloader pretty easy and metered you could probably get 5-6 shots a minute.
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MycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128819 - 01/05/21 05:22 PM (3 years, 23 days ago) |
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That might be a gamechanger, I think we got about 3-4 shot a min currently.
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
#27128854 - 01/05/21 05:30 PM (3 years, 23 days ago) |
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I once thought of trying to make a multi-barreled version but couldnt figure out the best way to do it....
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bodhisatta 
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Made this one to fit in a backpack. Takedown model lol. Uses measured mapp/propane. Made an ignitor "module" a piece of conduit fits over a bbq ignitor really well. And makes a great spark gap from the terminal to the conduit
The end cap is needed to get the exhaust out quicker if you want. With the U shape design the exhaust tended to get trapped in the combustion chamber and fucks with subsequent shots
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128891 - 01/05/21 05:47 PM (3 years, 22 days ago) |
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Cool design. I really enjoyed the threaded barrel as well. I never played with a U-shaped combustion chamber thou. 
How do you measure out the MAPP gas? I tried to do it with counting seconds but the combustion was never consistent.
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27128911 - 01/05/21 05:54 PM (3 years, 22 days ago) |
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Metering device like in the link above but i don't have it hard piped into the gun. It has a schrader valve chuck and the gun has a valve stem.
Then i can use my propane tank with any other gun by changing the pressure on a regulated type with a static discharge tube length. Or by using no regulator and different lengths of tube.
Threaded barrel lets you have different size barrels.
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LogicaL Chaos
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27128922 - 01/05/21 05:57 PM (3 years, 22 days ago) |
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Ah, gotcha! Direct connection via a valve stem. Very clever
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bodhisatta 
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] 1
#27128928 - 01/05/21 05:59 PM (3 years, 22 days ago) |
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Ive made fancier guns where the valve stem on the inside of the chamber has a soldered on copper pipe with holes so the propane evenly dispersed. Also with a "spark plate" that made dozens of sparks up and down the lenth of the chamber.
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roarkell
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
#27149525 - 01/15/21 10:40 AM (3 years, 13 days ago) |
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My buddies and I made one back in high school... thought we were badass... so my dad brought home some chunks of black pipe and welded one up in our garage... used acetylene for propellant... wasn't very efficient but holy fuck was it loud! Lmao
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HappyHigh
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos]
#27209897 - 02/16/21 05:36 PM (2 years, 11 months ago) |
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have you searched for rifled barrels I had one in my teens 2inch 5ft barrel. you could notice very quickly the difference +++
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