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"In the world of spuds today"

A place to ask general spud cannon related questions.
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Unread postAuthor: mark.f » Tue Jul 30, 2013 4:56 pm

<div align="center">Image Image :p</div>
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 30, 2013 5:01 pm

That looks a bit basic for someone of your experience, is there something radical inside you're not telling us about?
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Unread postAuthor: Gun Freak » Tue Jul 30, 2013 8:24 pm

Collapsible Travel Combustion. Clever ;)
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Unread postAuthor: Blitz » Tue Jul 30, 2013 11:31 pm

Ah yeah, I see now. Dur. That's pretty neat.
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 31, 2013 12:35 am

Gun Freak wrote:Collapsible Travel Combustion. Clever ;)


Try explaining it to the TSA though :D
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Unread postAuthor: Gun Freak » Wed Jul 31, 2013 8:13 am

Compact Potato Transporter :D
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Unread postAuthor: DYI » Mon Aug 26, 2013 9:55 am

In the world of spuds today:

Sabot design, shear skirts, and 3/8" tungsten carbide ball bearings.

Image

Image

Image

Image
(That's 10mm plate).

I didn't do much work on gas dynamic guns this summer, but I put together this little toy hybrid from spare parts and stock. I might post on it in a month or so, as it has some relatively novel features. It was my first attempt at implementing shear skirt projectiles, and has worked out well enough to encourage further experimentation at a later date. Unfortunately, that later date is almost two years away. Fortunately, I've finally started on that quasi-1D gun model in my sig.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 26, 2013 11:44 am

now you have my attention :D awesome!

So the sabot is also the "burst disk"?

What mix were you shooting at?
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Unread postAuthor: Brian the brain » Mon Aug 26, 2013 3:03 pm

Eehm..10mm steel plate??
That would've been considered armour in WW1..?

What kind of beast have you created?!?!

:roll:

Oh...and I really like looking at your skirt...and holes....
The damaged brass fitting...not so much... :D
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: DYI » Mon Aug 26, 2013 4:01 pm

jackssmirkingrevenge wrote:So the sabot is also the "burst disk"?

What mix were you shooting at?


The shear skirt is incorporated into the base of the sabot, yes. It's not shown in the FEA output though.

This was with 2.75 : 7.24 propylene / oxygen at a pre-ignition pressure of 12.8 bar (absolute pressure - the nitrogen content was ~ 0.1% due to pre-shot purging with propylene). The targeted maximum pressure was 4500psi.


@Brian:
It's steel plate, but not nearly so hard as would have been used for armour. I wouldn't call this a beast - it's a little over half as energetic as a 12 gauge shotgun firing slugs.

The brass fitting isn't really damaged - the sealing faces and bore are very smooth, and the barrel connection is sound. It's just ugly on the outside.


Incidentally, this breech can seal in both directions. Any guesses on why that is? :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 26, 2013 4:05 pm

DYI wrote:Incidentally, this breech can seal in both directions. Any guesses on why that is? :wink:


I wonder...
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Unread postAuthor: DYI » Mon Aug 26, 2013 4:26 pm

Got it in one. I didn't budget enough time to finish the second stage. Had I completed it, performance would have been similar to that of the electric gun I posted two years ago (which is currently out of commission due to a fairly impressive transformer explosion... :roll: ).
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 27, 2013 12:46 am

Brian the brain wrote:Oh...and I really like looking at your skirt...and holes


:roll: :D

Got it in one. I didn't budget enough time to finish the second stage.


*fap fap fa...

Can't wait to be surrounded with the sort of wilderness that allows this sort of expermintation :D

Had I completed it, performance would have been similar to that of the electric gun I posted two years ago (which is currently out of commission due to a fairly impressive transformer explosion).


No correspondingly impressive footage?
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Unread postAuthor: DYI » Tue Aug 27, 2013 6:57 am

jackssmirkingrevenge wrote:No correspondingly impressive footage?


The cameras were focused on the test apparatus, not the charging system.
The footage goes like this: *60Hz hum* ... *ominous hissing noise* ... "Hmm, I wonder what's making it do th- *screen whiteout* *BOOM* ... "[expletives deleted]".
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Unread postAuthor: Zeus » Tue Aug 27, 2013 7:59 am

He's alive, he's actually alive.

WB DYI, nice work
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/sarcasm, /hyperbole
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