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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: DYI » Sun May 22, 2011 9:44 pm

ITWOTOPRTST: Assembled capacitor bank, tested new voltage divider, confirmed that what I now regard as "low pressure" does this to type L 1/2" copper tube:

Image

(~2mL water heated by 3kJ pulse at 11kV. Burst pressure of the tube is ~7500psi)
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Unread postAuthor: warhead052 » Sun May 22, 2011 11:33 pm

DYI, all I can say to that is wow.
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Unread postAuthor: jackssmirkingrevenge » Mon May 23, 2011 1:40 am

drex wrote:I had a go at making an APFSDS round this week.


Image

Will you actually fire it, if so, at what please say steel plate please say steel plate please please please!?

DYI, what is "low pressure" then :D
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Unread postAuthor: drex » Mon May 23, 2011 10:59 am

Yea I'm gonna fire it! There's an old stove at my shop I'm going to shoot at tomarrow when I remember to bring my camera. :D
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Unread postAuthor: Alster370 » Mon May 23, 2011 3:19 pm

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Unread postAuthor: Zeus » Mon May 23, 2011 5:22 pm

It appears so, but I'm not sure it would be fast enough. Not to mention hydraulic seals don't seal well with most gases.

However I could be completely wrong.
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Unread postAuthor: Labtecpower » Tue May 24, 2011 9:17 am

I screwed up my backstop today :D

[youtube]http://www.youtube.com/watch?v=7PJ5278xB5Y[/youtube]
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Unread postAuthor: Technician1002 » Tue May 24, 2011 10:00 am

Nice. I like the cannon recoil. It bounces off something and ends up forward of where it started. What did you use for a projectile?
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Unread postAuthor: Labtecpower » Tue May 24, 2011 10:15 am

I placed the cannon against the doorstep, as I don't want to demolish my knees :D

I used the projectile shown on the previous page. It's a bullet with a stainless steel head, and an ABS body. A friend turned it at school, from some stuff lying around.
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Unread postAuthor: drex » Tue May 24, 2011 2:21 pm

Shot slap thru a stove with my APFSDS round at lunch. It did not fly as straight as I had hoped, Ill upload the high speed when i get of of work.
Image

entrance

Image


exit


Image


2X4 5 feet behind the stove


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Unread postAuthor: dewey-1 » Tue May 24, 2011 2:57 pm

drex wrote:Shot slap thru a stove with my APFSDS round at lunch. It did not fly as straight as I had hoped, Ill upload the high speed when i get of of work.


PM me all the dimensions and I can do a drawing to determine the CP (center of pressure). Please use decimal inches or metric for accuracy.

What is the distance from the nose tip to where the "rocket" balance point is? (CG center of gravity)
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Unread postAuthor: drex » Tue May 24, 2011 5:57 pm

[youtube]http://www.youtube.com/watch?v=-roPgxM8tQU[/youtube]
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Unread postAuthor: POLAND_SPUD » Tue May 24, 2011 11:36 pm

that looks like a direct effect of muzzle blast... next time use a gun with a smaller chamber
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Unread postAuthor: ramses » Wed May 25, 2011 8:16 pm

POLAND_SPUD wrote:that looks like a direct effect of muzzle blast... next time use a gun with a smaller chamber


or a muzzle brake/flash hider type thing. To appease JSR, you could use a 55 gallon drum as a suppressor/silencer.
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Unread postAuthor: the unit » Wed May 25, 2011 8:29 pm

also looks like the barrel wobble could have had an effect. also it looks like the sabot never discards, or it does so very late
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