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First 12kJ railgun shot

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First 12kJ railgun shot

Unread postAuthor: rp181 » Thu Jan 21, 2010 8:05 pm

I fired off a shot today, and had quite bad results. This was probably due to the fact
[1] projectile fit could have been better (see pics)
[2] error in measurements, I was unable to measure the voltage on the bank after firing, so a full 400 volts was assumed. In this pictures, you can see the arcing lasted all the way to the end of the rails, leading me to believe there was a charge left.
The projectile was not found (will be shot at the bullet resistant plastic next time).
The data:
-chronograph:
distance of wires: 10"
voltage charge: .667 volts
calculated projectile speed: <b>864.7 FPS</b>
-rogowski coil:
no data collected. Suspected to be signal diminishing due to long leads.
-rails:
projectile contact was made midway through the rails.

And the grand total of <b>273.4 joules</b> on kinetic energy, and <b>.02%</b> efficiency. <i>Keep in mind this is most likely a lot higher, as I was unable to measure the voltage after firing. </i>
See the whole project at: http://rp181.wordpress.com
Without further ado, a video and pictures:

[youtube]http://www.youtube.com/watch?v=MFF_BHjoJZU[/youtube]
<a href="http://www.flickr.com/photos/rp181/4294315932/" title="100_4942 by rp181, on Flickr"><img src="http://farm3.static.flickr.com/2789/4294315932_ebbab08362.jpg" width="500" height="375" alt="100_4942"></a>
<a href="http://www.flickr.com/photos/rp181/4294315922/" title="100_4941 by rp181, on Flickr"><img src="http://farm3.static.flickr.com/2712/4294315922_8213420669.jpg" width="500" height="375" alt="100_4941"></a>
<a href="http://www.flickr.com/photos/rp181/4294315920/" title="100_4940 by rp181, on Flickr"><img src="http://farm5.static.flickr.com/4041/4294315920_fd80882fec.jpg" width="500" height="375" alt="100_4940"></a>
<a href="http://www.flickr.com/photos/rp181/4294315948/" title="100_4952 by rp181, on Flickr"><img src="http://farm3.static.flickr.com/2760/4294315948_0383a27186.jpg" width="500" height="375" alt="100_4952"></a>
<a href="http://www.flickr.com/photos/rp181/4294315944/" title="100_4948 by rp181, on Flickr"><img src="http://farm5.static.flickr.com/4049/4294315944_108e0cefc2.jpg" width="500" height="375" alt="100_4948"></a>
<a href="http://www.flickr.com/photos/rp181/4294315936/" title="100_4946 by rp181, on Flickr"><img src="http://farm5.static.flickr.com/4036/4294315936_30a96e3d8b.jpg" width="500" height="375" alt="100_4946"></a>
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Unread postAuthor: tghhs » Thu Jan 21, 2010 9:23 pm

Sweet, I want one! :)

very interesting looking at the rails, just after 1 shot?
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Unread postAuthor: rp181 » Thu Jan 21, 2010 9:58 pm

yes, after one shot. As said, it was a very bad shot. You can see the projectile didn't make contact with the rails until it was well into them.
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Unread postAuthor: inonickname » Thu Jan 21, 2010 11:10 pm

When you get the projectile sorted out how many times do you think you'll be able to clean off a set of rails and use them for another shot?

Looking forward to more updates
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Unread postAuthor: rp181 » Thu Jan 21, 2010 11:16 pm

For serious shots, I wouldn't go more than 2 per set of rails.
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Unread postAuthor: Skywalker » Thu Jan 21, 2010 11:18 pm

Very Nice! That's an impressive set of beancans you have to run that thing. 12 KJ is a boatload. How much of the projectile energy could the injector account for?

Never thought I'd see rogowski coils mentioned on spudfiles!
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Unread postAuthor: rp181 » Thu Jan 21, 2010 11:37 pm

The numbers are given without the injector energy, forgot to mention that.
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Unread postAuthor: 245Tommy » Thu Jan 21, 2010 11:57 pm

How much power were you expecting?
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 22, 2010 12:05 am

Nice, shame there wasn't a target.
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Unread postAuthor: Zeus » Fri Jan 22, 2010 1:55 am

Do you have a 4hv thread for this. Also very nice, 12000J is a [insert expletive here] load. Have you considered this with your ETG.
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Unread postAuthor: psycix » Fri Jan 22, 2010 6:29 am

Neato :)

Isn't there any way to recycle used rails by sanding them or something?
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Unread postAuthor: Hubb » Fri Jan 22, 2010 9:02 am

I give this two thumbs up.
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Unread postAuthor: ramses » Fri Jan 22, 2010 11:26 am

Nice. I can't wait to see a better shot from this. When I made my first penny switch, the bank would occasionally dump through the metal vapor deposited on the wood base. For this reason, you may need to clean your Garolite enclosure from time to time.
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Unread postAuthor: rp181 » Sat Jan 23, 2010 9:52 pm

Rails are difficult to recycle, as deep pits develop.

I am considering an ETG, Im almost sure it will be my next project.

I am going to try to setup a target for the next shot, possibly a piece of the bullet resistant plastic in a steel angle frame.
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Unread postAuthor: maverik94 » Sat Jan 23, 2010 10:00 pm

Cool, ok, can anybody explain how these things work, I know there is something to do with an electromagnet, but I really don't understand what's going on there...
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