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Gippeto high coax see the official video

The International Potato Launching Association Forum. Discussion about regional spud meets, competitions, etc. Country specific activities and info shall be kept in here as well.
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Unread postAuthor: THUNDERLORD » Thu Apr 23, 2009 10:49 am

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!!! :P 8)
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Unread postAuthor: Gippeto » Thu Apr 23, 2009 8:02 pm

With a bit of luck, we'll find out soon. I received my spring today. :D


Wrong mold, that one's for 1/2" type M copper.

This is the mold before being reworked;
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Unread postAuthor: Sparkie » Thu Apr 23, 2009 8:51 pm

Never mind...I am as blind as a bat :oops:
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 24, 2009 1:54 am

May I reiterate how beautiful those slugs are, 10 points for all the work you've put into making this launcher a complete system.

I received my spring today.


So we can expect some 3,000 psi testing soon? :D
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Unread postAuthor: CpTn_lAw » Fri Apr 24, 2009 5:49 am

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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Unread postAuthor: jackssmirkingrevenge » Fri Apr 24, 2009 9:48 am

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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Unread postAuthor: Brian the brain » Fri Apr 24, 2009 11:14 am

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.. :D

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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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: sniper hero » Fri Apr 24, 2009 12:47 pm

:shock: I love it!

are there more specifications of the gun ?
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Unread postAuthor: far_cry » Fri Apr 24, 2009 12:50 pm

so how is the accuracy in this smooth barrel
did the shap of the slug help it to fly straight ?
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Unread postAuthor: ALIHISGREAT » Fri Apr 24, 2009 2:09 pm

Finally! the snow has subsided and we can see this beast in action :D but now i have to wait for 3000psi shots :roll: :lol:
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Unread postAuthor: Gippeto » Fri Apr 24, 2009 9:01 pm

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. :wink: )

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-sp ... 17366.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-pr ... 12803.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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Unread postAuthor: inonickname » Fri Apr 24, 2009 9:33 pm

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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Unread postAuthor: elitesniper » Fri Apr 24, 2009 10:47 pm

Thats so awsome! I can hear the whizzing of the bullet when you guys shoot! :)
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 25, 2009 12:11 am

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 debatethat was...
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