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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 » Thu Apr 26, 2012 8:26 am

yeah!
I just received the tungsten rods!
Each weighing 20g
:D

EDIT : impossible to grind! :?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2012 9:46 am

hahaha!

impossible to grind!


... so impossible to deform on impact ;)
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Unread postAuthor: Petitlu » Thu Apr 26, 2012 9:57 am

Yes !
but I can not make a point...
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2012 10:04 am

So what... it's a hole punch :D

... when can we expect the first test?
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Unread postAuthor: Petitlu » Thu Apr 26, 2012 10:11 am

Tomorrow morning or afternoon!
With other shots as the ball 8mm
:D
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2012 10:30 am

Excellent :)

it would be cool to see if the arrow sabot works too if you have time
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Unread postAuthor: Petitlu » Thu Apr 26, 2012 10:47 am

yes no problem!
How far I have to set the target?
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Unread postAuthor: DYI » Thu Apr 26, 2012 11:07 am

Are you using tungsten rods, or tungsten carbide? The former should grind on a normal wheel, and the latter, of course, requires a diamond wheel if you're trying to take off large amounts of material as would be required to make a point.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2012 11:13 am

Petitlu wrote:How far I have to set the target?


A couple of metres should be enough for the sabots to separate cleanly.
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Unread postAuthor: Petitlu » Thu Apr 26, 2012 11:22 am

tungsten carbide....
what is the difference?

2m ok ! :wink:
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Unread postAuthor: DYI » Thu Apr 26, 2012 11:47 am

Tungsten is a dense, high melting metal used for radiation shielding, very high temperature applications (mainly electrodes), and as an alloying element. Tungsten carbide is a ceramic (although what you actually buy is called a "cermet", a portmanteau of "ceramic" and "metal", due to it being tungsten carbide powder bonded together with a metallic filler) used mostly for tooling, and for wear resistance in general due to its high hardness.

Both have seen use as projectile materials due to their high densities, although tungsten is more dense than either of its carbides.
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Unread postAuthor: Petitlu » Thu Apr 26, 2012 11:59 am

ok thank you
I will use them as they are, I do not have the equipment for cutting ...
even the flat head, enter to the steel!
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2012 1:05 pm

Petitlu wrote:even the flat head, enter to the steel!


The SP-4 silent cartridgefires a simple flat headed steel cylinder:

Image

Image

At ten grams and firing at a low (by high mix hybrid standards) 200 metres per second, it claims complete penetration of one inch of pine board or, or a standard army steel helmet.

You're going to be firing a smaller diameter, harder and much denser projectile, probably at much higher velocity. I say prospects are good :)
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Unread postAuthor: al-xg » Thu Apr 26, 2012 1:25 pm

Oh come on, add a little bit of distance, there's not point in making fins other wise :)
of course you wouldn't want to miss the target, but unless it's really small that shouldn't be too much of a problem with a fixed canon.


At ten grams and firing at a low (by high mix hybrid standards) 200 metres per second, it claims complete penetration of one inch of pine board or

Seems about right in my experience, I've definitely made it though 1" of pine with my pneumatics and full bore projectiles.
The first shot I tried with a 4mm tungsten rod in my spring loaded ball valve air rifle at fairly low pressure made it though a 3.5" pine block.
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Unread postAuthor: Petitlu » Thu Apr 26, 2012 3:22 pm

photos :

Image


Image
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