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| THUNDERLORD |
 Posted: 04/23/2009 9:49 AM Post subject: |
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Loose Cannon
Joined: 28 Mar 2008
Posts: 1295
3814.51 Spud Bux
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Awesome vid and rifle!!
Hadn't seen it yet because no speakers or time on-line lately. 
The one shot seemed to pierce one layer of tank and bounce on second(?)
Wonder if 1000 or 3000psi will go through both sides (even with the soft lead projectiles....New Vid!!!   |
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| Gippeto |
| Posted: 04/23/2009 19:02 PM Post subject: |
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Donating Member
Joined: 19 Jan 2008
Posts: 1883
4673.49 Spud Bux
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With a bit of luck, we'll find out soon. I received my spring today. 
Wrong mold, that one's for 1/2" type M copper.
This is the mold before being reworked; |
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| Sparkie |
| Posted: 04/23/2009 19:51 PM Post subject: |
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Corporal
Joined: 26 Dec 2007
Posts: 62
173.77 Spud Bux
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Never mind...I am as blind as a bat  |
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| jackssmirkingrevenge |
| Posted: 04/24/2009 0:54 AM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18060
32518.54 Spud Bux
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May I reiterate how beautiful those slugs are, 10 points for all the work you've put into making this launcher a complete system.
| Quote: | | I received my spring today. |
So we can expect some 3,000 psi testing soon? |
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| CpTn_lAw |
| Posted: 04/24/2009 4:49 AM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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| See the recoil this beast has at 600 psi? can't imagine the brute force of one of these slugs being pushed by 3,000 psi... Amazing work Gippeto!! |
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| jackssmirkingrevenge |
| Posted: 04/24/2009 8:48 AM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18060
32518.54 Spud Bux
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| CpTn_lAw wrote: | | See the recoil this beast has at 600 psi? |
Indeed, perhaps some sort of muzzle brake is in order. |
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| Brian the brain |
| Posted: 04/24/2009 10:14 AM Post subject: |
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Dutch Spud Clan Leader
Joined: 05 Dec 2005
Posts: 2763
6458.86 Spud Bux
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Very impressive!
Seems like a very effective valve.
You might even hit a point where increasing the pressure won't do jack.
3000 psi might get you just at the soundbarrier!
Be sure to share the new ( spring) results asap..
Can you do a how to on those slugmolds?In case you already have, where can I find it? 
I mean..I get how to make a splitmold, but that nose is awsome!
how did you do that? |
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| sniper hero |
| Posted: 04/24/2009 11:47 AM Post subject: |
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Captain
Joined: 07 Mar 2008
Posts: 329
337.37 Spud Bux
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 I love it!
are there more specifications of the gun ? |
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| far_cry |
| Posted: 04/24/2009 11:50 AM Post subject: |
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Donating Member
Joined: 20 Aug 2008
Posts: 292
339.70 Spud Bux
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so how is the accuracy in this smooth barrel
did the shap of the slug help it to fly straight ? |
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| ALIHISGREAT |
| Posted: 04/24/2009 13:09 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
Posts: 1799
521.94 Spud Bux
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Finally! the snow has subsided and we can see this beast in action but now i have to wait for 3000psi shots   |
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| Gippeto |
| Posted: 04/24/2009 20:01 PM Post subject: |
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Donating Member
Joined: 19 Jan 2008
Posts: 1883
4673.49 Spud Bux
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Thanks! I hope to be casting some slugs tomorrow, shooting on Sunday???(Wife has plans for me. )
The recoil isn't bad, it's more of a "gentle, yet irresistible ... shove".(The co-ax weighs around 15 pounds.)(My nephew says the recoil is stronger than his R-15 carbine though. Took him by surprise.  )
Brian, I'm not sure which mold you're referring to, but the nose on small one for 1/2" copper was made with a modified HSS spade bit.
http://www.spudfiles.com/forums/easy-split-mold-for-foster-slugs-pictu re-intensive-t17366.html
The nose on the large mold was made using a 3/4" round nosed, carbide router bit.(This mold was made on the lathe.)
Specs can be found in the build log;
http://www.spudfiles.com/forums/high-pressure-co-axial-updated-02-11-0 8-t12803.html
Far Cry,
The slugs were tumbling end over end at the lower pressure and velocity, accuracy was not good. The shots on the fuel tank were taken at ~15m, not all hit.
I've reworked the slug mold again to place even more of the mass in the front of the slug. We'll have to wait until I fire some to see if there is any improvement.
I'm fairly confident that they'll work better at higher velocities, and the new hammer spring should make that possible.(Crosses fingers.) |
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| inonickname |
| Posted: 04/24/2009 20:33 PM Post subject: |
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Major General
Joined: 07 Dec 2008
Posts: 2487
6556.71 Spud Bux
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Awesome,
You should consider using a more pointed tip on your ammunition if they're going supersonic (should with nitrogen). At sub supersonic speeds, rounded noses are the most efficient but at supersonic speeds a pointed tip as you would see in a rocket nosecone is best. For hypersonic, the tip is rounded then it slopes down to a cone I believe.
But we're not going that fast, so a pointy tip is probably best.
Can't wait to see them.. |
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| elitesniper |
| Posted: 04/24/2009 21:47 PM Post subject: |
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Brigadier General
Joined: 13 Oct 2007
Posts: 1089
1061.44 Spud Bux
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| Thats so awsome! I can hear the whizzing of the bullet when you guys shoot! |
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| jackssmirkingrevenge |
| Posted: 04/24/2009 23:11 PM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18060
32518.54 Spud Bux
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| inonickname wrote: | | You should consider using a more pointed tip on your ammunition if they're going supersonic (should with nitrogen). At sub supersonic speeds, rounded noses are the most efficient but at supersonic speeds a pointed tip as you would see in a rocket nosecone is best. For hypersonic, the tip is rounded then it slopes down to a cone I believe |
And what a debate that was... |
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