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XP21 Thundersquish Tactical Marshmallow Cannon

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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XP21 Thundersquish Tactical Marshmallow Cannon

Unread postAuthor: John Conklin » Thu Jan 21, 2010 6:11 pm

I was thinking about my grandkids’ marshmallow shooter, and started wondering "If you accelerate a marshmallow to a high enough velocity, would it be able to penetrate plywood?"


yep.

Many thanks to Technician for his piston valve design concept & inspiration.

[youtube]http://www.youtube.com/watch?v=ASf5cX7Z2-4[/youtube]
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Attachments
CIMG2072.jpg
Raw materials scrounged from the bone pile.
CIMG2087.jpg
Air reservoir end caps TIG welded in place.
CIMG2106.jpg
Stainless steel valve body port holes drilled.
CIMG2109.jpg
Valve body ports opened up & rounded.
CIMG2120.jpg
Valve body tacked into air reservoir.
CIMG2124.jpg
Interior view of valve body showing ports & polishing.
CIMG2146.jpg
Cannon painted & hanging to dry.
CIMG2311.jpg
UHMW-PE Piston.
CIMG2346.jpg
Ready for testing.
CIMG2348.jpg
Marshmallow before & after a trip through 1/2" OSB.
CIMG2343.jpg
Entry hole in OSB.
CIMG2344.jpg
Exit hole
CIMG2347.jpg

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Unread postAuthor: twizi » Thu Jan 21, 2010 6:14 pm

very nice

is that a pvc barrel
what psi u usin
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dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
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Unread postAuthor: Ragnarok » Thu Jan 21, 2010 6:17 pm

Neat, but I'd point out that OSB is not actually plywood - it's rather less impact resistant than true plywood.

Still, impressive performance nonetheless. Any idea what kind of velocity you're getting?
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: John Conklin » Thu Jan 21, 2010 6:27 pm

Twizi: That is indeed a pvc barrel, pressure rated at 465 PSI. These shots were made with 160 PSI air.

Ragnarok: Yes, I know that OSB is not technically plywood, but it was the only thing I had in the bone pile at the time. My goal is to punch through 3/4" true plywood. -More on that as events unfold.
According to GGDT, the muzzle velocity is around 850 FPS and the KE is approximately 175 ft-lbs.
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Unread postAuthor: twizi » Thu Jan 21, 2010 6:31 pm

did u use that drill press to make that pistion
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Unread postAuthor: John Conklin » Thu Jan 21, 2010 6:33 pm

I did for the first one, but I have a machinist friend who turned this one for me.
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Re: XP21 Thundersquish Tactical Marshmallow Cannon

Unread postAuthor: jackssmirkingrevenge » Fri Jan 22, 2010 12:21 am

John Conklin wrote:I was thinking about my grandkids’ marshmallow shooter, and started wondering "If you accelerate a marshmallow to a high enough velocity, would it be able to penetrate plywood?"


Wish I had relatives like that as a child :roll:

Nice build, though is it really "tactical" before you slap on a few weaver rails and add a scope, laser and torch?
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Re: XP21 Thundersquish Tactical Marshmallow Cannon

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Unread postAuthor: inonickname » Fri Jan 22, 2010 12:29 am

Wish I had relatives like that as a child

We're all family here Jack, never to late to be a child :roll:

Extremely nice. I'd assume you've taken into account annealing weakening the material, but it all seems extremely well done. Looking forward to seeing more :)
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PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
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Unread postAuthor: John Conklin » Fri Jan 22, 2010 12:36 am

My god man!! I think you've hit on something here :D
A laser sight would be perfect!

The problem I'm having is that I seem to be losing interest in this gun because I'm already fixating on the next (newer/bigger/faster/taller) gun.
Is this the normal sequence of events in the life of a spudgunner?

This, by the way, is my first gas gun endeavour. It would seem that I'm going to be spending an inordinate amount of time finding new ways to propel food products at high rates of speed.

Inonickname: You are correct. The steel being used is 50 KSI P&O steel, TIG welded and stress relieved per AWS qualified procedures.
Safety is always first & foremost in my shop.
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Last edited by John Conklin on Fri Jan 22, 2010 12:44 am, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Fri Jan 22, 2010 12:40 am

John Conklin wrote:The problem I'm having is that I seem to be losing interest in this gun because I'm already fixating on the next (newer/bigger/faster/taller) gun.
Is this the normal sequence of events in the life of a spudgunner?


Completely, welcome to the fold :D
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Unread postAuthor: John Conklin » Fri Jan 22, 2010 12:48 am

Thank you.
I've been pouring over this forum for about a month now, and I'm pleased (impressed?) to see the very open exchange of ideas & feedback.
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Unread postAuthor: deathbyDWV » Fri Jan 22, 2010 12:49 am

Very nice work on this.

Hmm... New ways to propel food products.

What is HYBRID?

CORRECT!!!

How about a hybrid?

Also the harder better faster stronger thing is all too normal. :D

And have you ever tried (just for fun) to make a marshmallow that you've already shot, shoot again? Even though they're squished, you could try...
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Unread postAuthor: John Conklin » Fri Jan 22, 2010 12:55 am

I've been thinking about a hybrid, but first I'm going to try going supersonic with 200 PSI helium... just to see if it can be done.
I'll try the used marshmallow idea. Might be interesting!
Also, I'm going to paint some marshmallows fluorescent orange (to make them easier to track) and see how far I can lob one.
I really want a crono & high speed camera now :lol:

Oh... and a lathe
And time. Lots of free time.
And a butload of money.

(**sigh**)
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