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Copper Marble 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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Unread postAuthor: al-xg » Mon Dec 31, 2012 9:13 pm

Fight Club
Das Boot
;)

That is a beautiful shot, the starch patterns are impressive.
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Unread postAuthor: MrCrowley » Tue Jan 01, 2013 2:53 am

Just saw this (linked by the well-known blogger 'Bad Astronomer') :)
http://www.slate.com/blogs/behold/2012/ ... hotos.html

Nice work with the new photos, I think the banana one is my favourite of the lot.

And I am curious about the photograph for Mr Crowley. It's just a strange little picture. Who, what, were is it from?

As al-xg has said above, it's from the movie Das Boot. Specifically, the 2nd Lieutenant played by the actor Martin Semmelrogge. If you love a good war film, I can highly recommend the Das Boot director's cut version in German with English subtitles.
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Unread postAuthor: cometboy » Tue Jan 01, 2013 9:47 am

Mr Crowley, al-xg

Thank you for the explanation.

As far as the banana, in my experience if you shoot a lot of stuff, some pictures turn out. Maybe one in five. And out of those that turn out, a few turn out good.

The banana shot above is good.

It's the high speed version of "spray and pray"

Cheers.
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 01, 2013 10:01 am

cometboy wrote:I ran it up to 200psi and shot a few bearings. Much faster, I don't have velocity numbers but it goes through ~100% more plywood, about 1".


That makes sense, as I said before, double pressure and double the energy.

Here is a banana at 110psi. I like it.


Love it, especially the fact that the bearing is clearly visible!

First what revenge is jack smirking about?


[youtube]http://www.youtube.com/watch?v=lWFtg3Z4TzY[/youtube]

Alas I was going through a bit of a nihilistic phase when I joined this forum

. :roll:
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Unread postAuthor: cometboy » Sun Jan 20, 2013 8:41 pm

I have slowly been putting together a higher pressure set-up for the steel bearing throwing cannon and got a speed reading a little while ago.

At about 200psi the speed is 680fps, much higher than the ~120psi/520fps from the standard air compressor. I don't have any pictures shot at the higher velocity but the two below are with the lower pressure set-up.

I have not been in any hurry to build the higher pressure set-up since the lower pressure results are pretty much good enough.

<a href="http://www.flickr.com/photos/8763834@N02/8365613493/" title="Jumping Jellyfish by alan_sailer, on Flickr"><img src="http://farm9.staticflickr.com/8496/8365613493_99bd70398c.jpg" width="500" height="282" alt="Jumping Jellyfish"></a>

Above a christmas bulb with colored tempera paint inside.

<a href="http://www.flickr.com/photos/8763834@N02/8396386162/" title="Green Eyes by alan_sailer, on Flickr"><img src="http://farm9.staticflickr.com/8229/8396386162_d82610f72c.jpg" width="500" height="307" alt="Green Eyes"></a>

A ceramic dolls head filled with clear gelatin.

Cheers.
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 21, 2013 1:08 am

cometboy wrote:A ceramic dolls head filled with clear gelatin.


... and my new wallpaper, fantastic!
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Unread postAuthor: Brian the brain » Tue Jan 22, 2013 9:45 am

The ceramic dolls head picture is just epic!

Do you have slowmo footage of that one?
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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: mark.f » Tue Jan 22, 2013 6:23 pm

As I recall, these are strobe shots... probably no slomo footage (of the same shot).
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Unread postAuthor: cometboy » Tue Jan 22, 2013 6:39 pm

Brian,

Video could be done but my hobby does not support a 30,000$ (new) price for a good color high speed camera.

In any case, what you gain in multiple pictures you lose in resolution. Like any engineering issue it's all about compromise.

I had a friend who has intermittent access to a high speed video camera come by last year. This doll head was not shot, it was exploded...

http://www.flickr.com/photos/8763834@N0 ... 1800146506

Cheers.
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 22, 2013 6:41 pm

HAHA! Love how the eyes come off intact, brilliant!
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