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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 » Tue Jun 19, 2012 12:59 am

Hehe it's the only hvbrid I have working at the moment :)
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Unread postAuthor: Petitlu » Tue Jun 19, 2012 1:02 am

Et un peu le ThorJack aussi ! :wink:
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2012 1:05 am

hehehe, I'm spudding by proxy :D
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Unread postAuthor: Petitlu » Tue Jun 19, 2012 1:39 am

I will try to make a mold of a spoiler delrin that thou hast made​​.
I can then pour it hot glue for example
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2012 2:00 am

Petitlu wrote:I will try to make a mold of a spoiler delrin that thou hast made​​.


Shakespeare translator again :D

I can then pour it hot glue for example


Hot glue will not be strong enough... maybe a brass mould for lead, along the lines of this one but for a dart shape?
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Unread postAuthor: Petitlu » Tue Jun 19, 2012 2:06 am

replace the delrin glue on a concrete example nail dart

or a mold with the shape of your APFSDS where I can put a tungsten rod ...
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2012 2:15 am

Epoxy resin would be a better idea :) if you have access to some I can quite easily mill a fin mould that will fit a nail or the tungsten.
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Unread postAuthor: Petitlu » Tue Jun 19, 2012 2:21 am

It would be such a great mold :!:

I have much of epoxy because I'm stratification carbon and kevlar for my water rockets
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2012 2:39 am

Excellent :) I'll see what I can cook up. Remind the exact diameters of your nails? (both smooth part and ridged part)

Also do you have access to 12mm rod to cut pusher plates out of, or do you need moulds for these as well?
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Unread postAuthor: Petitlu » Tue Jun 19, 2012 2:53 am

For the pusher plate I can use plastic rods or rubber roller for valves.
it is certain that mold would be more accurate

dimensions of nails:
Smooth diameter: 3.4mm
Striated diameter: 3.5mm
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2012 5:03 am

Hmmm, for synthetics I could actually make the mould out of delrin. I might give it a go today if I get home at a reasonable hour.
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Unread postAuthor: Petitlu » Tue Jun 19, 2012 5:24 am

Great!
thank you!
:D
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 23, 2012 1:13 am

Damn, pure tungsten is *really* brittle - this happened when I dropped it on the floor!
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Unread postAuthor: Petitlu » Sat Jun 23, 2012 2:37 am

:shock: :shock:

this is glass!
I'll keep using carbide ...
The fin brass looks good!

This afternoon I fire!
I prepared new projectiles

Image

Image

Image
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 23, 2012 5:14 am

Interesting! So you've added a copper sheath for the tungsten? That first one, what is it exactly?

I made a brass dart for the broken half of the tungsten, at 17x it made a brass lined hole exactly half way through the plate, 1/8".

[youtube]http://www.youtube.com/watch?v=ufdgwj87Uq8[/youtube]
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