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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 » Fri Apr 06, 2012 2:42 pm

Soon the Mix40 and I stopperai tests, I will lelook of ThorJack.
the nail is 3.4mm in diameter.
My ignition with a coil will now, it's more reliable than flash ignition.
I can shoot different kinds of bullets with Thorjack, that's cool!
seals bullets do not penetrate toothe projectiles steel / aluminum poles through well!
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 08, 2012 5:17 pm

Tough target to crack, but achievable in my view.

Take the russianSP-6 subsonic round as an example:

Image

Image

It features a 16 gram bullet with a hardened steel core fired at "only" 950 feet per second which is quoted as penetrating 8mm of steel plate at 100 metres.

What is needed is something heavier and harder than a nail as a penetrating core...
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Unread postAuthor: Petitlu » Sun Apr 08, 2012 5:28 pm

yes I understand ...
a tungsten rod would be useless.
the projectile skirt steel / aluminum penetrated out of two sides ...
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 08, 2012 5:47 pm

Petitlu wrote:the projectile skirt steel / aluminum penetrated out of two sides ...


I'm afraid I didn't quite understand that one...
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Unread postAuthor: al-xg » Sun Apr 08, 2012 6:11 pm

VF ?
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Unread postAuthor: Petitlu » Mon Apr 09, 2012 3:53 am

les projos que je tire avec le Withoutloss ou le Thorjack, ceux avec la tête acier et la jupe alu sont bien pénétrant justement parceque la pointe est massive et dure. en exemple la section acier galva traversée de part en part récemment

I spoke of my bullets that pierce the steel

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Unread postAuthor: jackssmirkingrevenge » Mon Apr 09, 2012 4:44 am

Ah OK.

Maybe something like an old drill-bit will be ideal as a penetrating core...
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Unread postAuthor: Petitlu » Mon Apr 09, 2012 5:03 am

yes 8 mm in diameter with a shoe for the barrel cal.50
D10mm if you put an aluminum tube as in the picture
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 09, 2012 5:30 am

can you look for cheap/used/second hand carbide drill bits on ebay.fr?

Something like this eh ;) http://cgi.ebay.fr/Jeu-de-9-meches-a-ma ... 43aa5b20d5

not too expensive...
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Unread postAuthor: Petitlu » Mon Apr 09, 2012 5:55 am

ok but these have only drill head of tungsten ...

EDIT : I have found several drill used for 8 and 10mm in my closet! :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 09, 2012 7:02 am

Petitlu wrote:EDIT : I have found several drill used for 8 and 10mm in my closet! :wink:


expect some fins for those then ;) we should make a list and I will cook up a batch of sabots when I have time.
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Unread postAuthor: DYI » Mon Apr 09, 2012 9:40 am

@JSR: if he found a suitable carbide drill, he'd still need the special wheel to grind it to a point. An old 6mm or so tap ground to a point wouldn't perform quite as well, but from a hybrid like this using a proper sabot would still penetrate 20mm of mild steel without much trouble.
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Unread postAuthor: Petitlu » Mon Apr 09, 2012 9:54 am

I'll make a list!
thank you Jack
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 09, 2012 11:07 am

DYI wrote:@JSR: if he found a suitable carbide drill, he'd still need the special wheel to grind it to a point.


Not necessarily :wink:

I find it conceivable that it would act as a punch without being ground to a point.
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Unread postAuthor: al-xg » Mon Apr 09, 2012 12:48 pm

But then it's just tool steel with a carbide tail...

Actual tungsten rods would make more sense in my opinion, they're actually denser, harder than steel, just cylindrical and can be cut to length, can be made pointy, if wanted, with a bit of persuasion ( Ok I must admit it did take me a little while to make a 4mm rod pointy without proper tools)...

They're not as easy to find on ebay.fr, but shipping from England is generally not that bad, in fact I'm pretty sure I had mine sent to France while I was there. (the French a re pretty useless with the whole Ebay thing...)
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