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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: jackssmirkingrevenge » Sat Apr 28, 2012 11:22 pm

HunterT wrote:Getting ahold of AP ammo is probably not a realistic option, but I just thought I'd throw it out as something to think about.


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Unread postAuthor: HunterT » Sun Apr 29, 2012 1:00 am

Those wouldn't be AP bullets, probably dug out of the hillside of some world war II battleground, would they?

edit: just noticed the rust. more likely hardened steel cores?
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 29, 2012 1:39 am

HunterT wrote:more likely hardened steel cores?


Yup, from AK fire.

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Probably Chinese made though, so steel of dubious quality, certainly inferior to the carbide rods Petitlu is feeding his hybrid with.
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Unread postAuthor: Petitlu » Sun Apr 29, 2012 1:52 am

must be found ... not easy :(
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Unread postAuthor: HunterT » Sun Apr 29, 2012 2:19 am

jackssmirkingrevenge wrote:Probably Chinese made though, so steel of dubious quality, certainly inferior to the carbide rods Petitlu is feeding his hybrid with.


Agreed.
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Unread postAuthor: RJB INDUSTRIES » Sun Apr 29, 2012 11:25 am

What about lining the interior of the combustion chamber with those adiabatic bags, like the hermetics ones..... Because the loss of energy....


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Unread postAuthor: Petitlu » Sun Apr 29, 2012 12:34 pm

I did not understand ... RJB
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 29, 2012 12:36 pm

A metal chamber absorbs heat and technically reduces power, he is suggesting insulating it.
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Unread postAuthor: Petitlu » Sun Apr 29, 2012 12:40 pm

hmm ... I do not see how one could isolate the chamber ! :shock:
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 29, 2012 12:55 pm

Expanding foam :D to be honest I don't imagine it would make an enormous difference in power.
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Unread postAuthor: Petitlu » Sun Apr 29, 2012 1:04 pm

Expanding foam :lol:

totally agree with you for the power difference !

And personally, I am satisfied with its actual power!
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Unread postAuthor: al-xg » Sun Apr 29, 2012 2:13 pm

You'd have to insulate the inside of the chamber not the outside.
I'm pretty sure anything on the outside would make near to no difference on a chamber with thick metal walls with such a short burn time, the projectile will be long gone before the walls heat up and then start heating up the surrounding air.


Edit: D'oh, I obviously can't read :oops:
Well in that case, I'd say it does have an effect along with chamber geometry and exposed surface area. But you're not exactly going to tell unless you actually measure projectile speed.

Even a 10% difference would be hard to notice when just shooting at point blank range.
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Unread postAuthor: RJB INDUSTRIES » Sun Apr 29, 2012 2:44 pm

Of course involving all the surfaces inside the chamber, but yes, maybe we won´t see any diference....


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Unread postAuthor: Fnord » Sun Apr 29, 2012 2:54 pm

It doesn't make much difference in hybrid guns. I think the way HGDT handles heat loss is probably somewhat accurate, and setting the system to 'adiabatic' produces little difference at high mixes.
A normal combustion may benefit, but remember that most of the energy being lost is still in the form of infrared light. You'll want to avoid traditional insulation in favor of a polished aluminum/copper chamber lining.
In theory it should put most of the emitted IR energy back into the combustion gases, but it's never been tested at this point.
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Unread postAuthor: RJB INDUSTRIES » Sun Apr 29, 2012 3:22 pm

A Polished aluminium/copper chamber lining?

Are you sure, it isolates the IR?


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