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Hybrid ThorJack

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: Petitlu » Sat Jun 23, 2012 5:54 am

Nice shot!
yes I covered tungsten by copper tubing 6/8mm.
For the tungsten will not fragment on.
The first tip is a tip of arrow arc stainless steel, it is small, 4mm in diameter and 46mm in length.
the black circles, it's tap rubber roller.

For the big stainless steel spike, it is free in the aluminum sabot for that the sabot does not stop the penetration.
Against the IPN, the aluminum skirt had prevented the point passes through ...
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Unread postAuthor: Fnord » Sat Jun 23, 2012 9:07 am

I don't think pure tungsten is very hard; look it up on wikipedia. It's only when impurities are added that it becomes brittle. You guys should be using some of the softer stuff, and just making replaceable penetrator tips for it. High-carbon steel rod is fairly cheap, and can be machined well when annealed.
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 23, 2012 11:10 am

Petitlu wrote:For the big stainless steel spike, it is free in the aluminum sabot for that the sabot does not stop the penetration


That would have to be fired at point blank range, before it has time to start tumbling significantly.

I don't think pure tungsten is very hard; look it up on wikipedia. It's only when impurities are added that it becomes brittle. You guys should be using some of the softer stuff, and just making replaceable penetrator tips for it. High-carbon steel rod is fairly cheap, and can be machined well when annealed.


This stuff isn't hard at all, I can dent it and even snip it with a pair of pliers. Tungsten carbide is or course a better idea.
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Unread postAuthor: Petitlu » Sat Jun 23, 2012 11:13 am

I had 4 shots!
there are good things!

:D :D
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Unread postAuthor: Petitlu » Sat Jun 23, 2012 11:30 am

pending the videos:


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Unread postAuthor: Petitlu » Sat Jun 23, 2012 3:55 pm

vidéo :
[youtube]http://www.youtube.com/watch?v=JuQQ0C2U0XQ[/youtube]
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Unread postAuthor: ramses » Sat Jun 23, 2012 5:09 pm

It almost looks like you got some impact flash, though its quite unlikely. The frame after the one you paused at at the very end of the video should show it.

Great work!
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Unread postAuthor: Petitlu » Sat Jun 23, 2012 5:17 pm

Thank you!
the flame that we see in 4'44 "is due to black rubber sabot that burned!
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Unread postAuthor: MrCrowley » Sat Jun 23, 2012 5:42 pm

Wow, some impressive results! Were you worried about ricochets at all? I think I would be too scared to fire tungsten nails in to brake disks if I were holding the gun.
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Unread postAuthor: Petitlu » Sat Jun 23, 2012 5:50 pm

Thank you

ricochets are most often lateral ...
So no, not really scared.
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 24, 2012 12:55 am

MrCrowley wrote:Wow, some impressive results! Were you worried about ricochets at all? I think I would be too scared to fire tungsten nails in to brake disks if I were holding the gun.


I wouldn't have risked it with the non-carbide projectiles - but some fantastic results!
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Unread postAuthor: Petitlu » Sun Jun 24, 2012 2:07 am

Thank you!
I did not think that the nail pass through, they are really robust.
Put an envelope on the tungsten is a good idea to exploit ..
I am surprised by the big arc tip, a lot less damage than the profile.
The small arc tip was not broken, it's good, but I'll put more rubber! it burned and I have to clean the barrel now .....
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 24, 2012 2:15 am

Petitlu wrote:The small arc tip was not broken, it's good, but I'll put more rubber! it burned and I have to clean the barrel now .....


I still have to have a go at making you a mould to cast proper fins and pusher plates, I tried earlier this week but I must not have been paying attention...
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Unread postAuthor: Petitlu » Sun Jun 24, 2012 2:30 am

Thank

"paying attention ..."?
google is a bad translation, I do not understand ... :cry:

The mold is in two parts?
The epoxy does not stick on delrin?
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 24, 2012 4:16 am

[youtube]http://www.youtube.com/watch?v=tAamnj6fd_E[/youtube]

Still no penetration, rrrr...

Petitlu wrote:"paying attention ..."?
google is a bad translation, I do not understand ... :cry:


I was distracted and didn't measure it out properly.

The mold is in two parts?


I was thinking one part as per the renderings below, this is for the nail (you would need to cut the head off).

The epoxy does not stick on delrin?


If it's smooth, not really - but you would need to help it with a bit of grease.
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