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OfflineLogicaL ChaosM
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Potato Launchers/Potato Cannons
    #26658038 - 05/08/20 06:06 PM (3 years, 10 months ago)

Ever built a Potato Launcher/Cannon before? If so, what pipe material, design and fuel/propellant did you like the best?


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OfflineFotosonik
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26658264 - 05/08/20 07:30 PM (3 years, 10 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: Fotosonik]
    #26658270 - 05/08/20 07:32 PM (3 years, 10 months ago)

Epic first post! Wow! What a cool creation. I love to see a pic of that if there was one.

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OfflineCOPain
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26658304 - 05/08/20 07:42 PM (3 years, 10 months ago)

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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InvisiblebodhisattaMDiscordReddit
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Re: Potato Launchers/Potato Cannons [Re: COPain] * 1
    #26662068 - 05/10/20 10:23 AM (3 years, 10 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26662106 - 05/10/20 10:49 AM (3 years, 10 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26662110 - 05/10/20 10:51 AM (3 years, 10 months ago)

Pvc joints should never leak if made correctly. It literally melts the polymer together

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Re: Potato Launchers/Potato Cannons [Re: bodhisatta] * 1
    #26662117 - 05/10/20 10:53 AM (3 years, 10 months ago)

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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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26662120 - 05/10/20 10:54 AM (3 years, 10 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26662129 - 05/10/20 10:58 AM (3 years, 10 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26662135 - 05/10/20 11:02 AM (3 years, 10 months ago)

Alright will do. I guessing primer is involved (i didnt use primer).

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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26662150 - 05/10/20 11:08 AM (3 years, 10 months ago)

Yes primer is necessary

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OfflineLogicaL ChaosM
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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26662154 - 05/10/20 11:10 AM (3 years, 10 months ago)

Do u use more glue than typical? And does the primer help with preventing the honeycomb issue?

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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos]
    #26662166 - 05/10/20 11:14 AM (3 years, 10 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26662168 - 05/10/20 11:16 AM (3 years, 10 months ago)

Right. Excellent info. U ever spray paint them afterwords?

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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26662171 - 05/10/20 11:16 AM (3 years, 10 months ago)

A long time ago i did one with paint. The krylon for plastic works good

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Re: Potato Launchers/Potato Cannons [Re: bodhisatta]
    #26662175 - 05/10/20 11:17 AM (3 years, 10 months ago)

Oh nice! I just bought some Krylon for a jetski paint job Im working on.

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OfflinePrimeMulch
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Re: Potato Launchers/Potato Cannons [Re: LogicaL Chaos] * 1
    #26885155 - 08/17/20 03:36 PM (3 years, 7 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: PrimeMulch] * 1
    #26885178 - 08/17/20 03:50 PM (3 years, 7 months ago)

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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Re: Potato Launchers/Potato Cannons [Re: bodhisatta] * 1
    #26888954 - 08/19/20 06:17 PM (3 years, 7 months ago)

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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