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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.
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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.
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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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bodhisatta 
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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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bodhisatta 
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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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