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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: PrimeMulch]
    #26889130 - 08/19/20 08:30 PM (3 years, 7 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: bodhisatta] * 1
    #26891236 - 08/21/20 08:03 AM (3 years, 7 months ago)

Meanwhile in rural Holland






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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: Asante]
    #26912130 - 09/01/20 02:39 PM (3 years, 6 months ago)

Now thats A Potato Cannon! :eek:

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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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos]
    #26912216 - 09/01/20 03:29 PM (3 years, 6 months ago)

Sounds like something went extremely wrong

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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26912224 - 09/01/20 03:35 PM (3 years, 6 months ago)

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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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos]
    #26912230 - 09/01/20 03:38 PM (3 years, 6 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26944156 - 09/19/20 01:20 PM (3 years, 6 months ago)

I used the blue PVC cement so I dunno know :shrug:

Found this gif meme, had to post :cool:


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OfflineSugabearcrisp
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #27121586 - 01/02/21 06:25 AM (3 years, 2 months ago)

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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OfflineMycoBrainz
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Re: Potato Launchers/Potato Cannons [Re: Sugabearcrisp] * 1
    #27121614 - 01/02/21 06:54 AM (3 years, 2 months ago)

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.


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Edited by MycoBrainz (01/02/21 06:56 AM)

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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
    #27121616 - 01/02/21 06:56 AM (3 years, 2 months ago)

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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OfflineSugabearcrisp
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #27121625 - 01/02/21 07:07 AM (3 years, 2 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #27121691 - 01/02/21 08:21 AM (3 years, 2 months ago)

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: 


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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: Sugabearcrisp] * 1
    #27121813 - 01/02/21 10:37 AM (3 years, 2 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #27122054 - 01/02/21 12:55 PM (3 years, 2 months ago)

Damn, thats high tech! I should look into those metering devices :thumbup:

Sugabear, I never used the clear stuff. Perhaps thats why my blue PVC cement went swiss cheese on me :strokebeard:

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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #27122837 - 01/02/21 08:51 PM (3 years, 2 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #27125822 - 01/04/21 10:51 AM (3 years, 2 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
    #27125846 - 01/04/21 11:02 AM (3 years, 2 months ago)

Thats wild man! I saw that u prefer ABS :awehigh:

How did u "inject" the iso/gasoline fuel mixture into the chamber?

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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #27126079 - 01/04/21 12:32 PM (3 years, 2 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
    #27126117 - 01/04/21 12:47 PM (3 years, 2 months ago)

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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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: MycoBrainz]
    #27126150 - 01/04/21 01:06 PM (3 years, 2 months ago)

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.



:whyyy:

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