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hybrid cartridge protoype without burst disk

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 » Mon Apr 19, 2010 2:15 am

zomgwtfbbq wrote:Wow the diameter is 1/4 inch?


External diameter of the body is 3/8"

That's really small!


Yup, the target is to have something in the size range of firearm cartridges

And 200 psi is really sexy.


That would be a 14x mix :D but I doubt the spark ignition would work at those pressures. In practice I'd be happy with a 6x mix at 75 psi, we'll see this evening.
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Unread postAuthor: zomgwtfbbq » Mon Apr 19, 2010 4:04 am

I didn't expect the friction seal to hold up to 200 psi. This gives me a lot of hope for my own friction seal. When will the long awaited video be up?!

we'll see this evening.


EDIT *** Opps, didn't see that.








EVENING IT SHALL BE (:
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 19, 2010 4:39 am

zomgwtfbbq wrote:I didn't expect the friction seal to hold up to 200 psi. This gives me a lot of hope for my own friction seal.


It depends on the seal you're using, I had some seals in my HPA BBMG prototypes that held at 850 psi :roll: this particular seal I'm using is 4mm internal diameter silicon tubing, I think I had bought it from a pet store, the sort of thing they use in an aquarium, so it shouldn't be hard to find. It is affected by the internal diameter of the seal vis a vis your projectile diameter, as well as how much the seal can yield (depending on material thickness and hardness).

zomgwtfbbq wrote:EVENING IT SHALL BE (:


Don't put your hopes up, but I'm keeping all appendages crossed :)

update: see! no go with teh sparks. I'm trying my luck with the hot wire, watch this space...
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Unread postAuthor: zomgwtfbbq » Mon Apr 19, 2010 2:04 pm

Have you tried at 1 bar? ):
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 19, 2010 3:13 pm

zomgwtfbbq wrote:Have you tried at 1 bar? ):


1 bar, 2 bar, 3 bar, 4 bar, 5 bar, no go :cry:

I tried with the hot wire, it was incandescent instantly (I could see it glow red through the araldite!) but still no ignition. I must be having mix/pressure issues, I think this really is too small to be practical...
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Unread postAuthor: theBOOM » Mon Apr 19, 2010 3:26 pm

What is the volume of this new cartridge you made?
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 19, 2010 3:55 pm

Just 1.7 cm<sup>3</sup>...
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Unread postAuthor: irisher » Mon Apr 19, 2010 3:59 pm

Just 1.7 cm3
wow mine was a 85cc.
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Unread postAuthor: Lentamentalisk » Mon Apr 19, 2010 4:59 pm

I guess the trick with these would be to have a premixed tank that you charge your cartridges from. Like a HPA tank, but filled with a 10x mix rather than 3000psi of air. that way all you would have to do is press the schrader up to a tire fill head, and it would be charged.

The other option would be to use something with a wider combustibility range, like hydrogen.
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 19, 2010 5:05 pm

Lentamentalisk wrote:The other option would be to use something with a wider combustibility range, like hydrogen.


... or just stop trying to make everything so friggin' tiny! :roll:
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Unread postAuthor: irisher » Mon Apr 19, 2010 5:11 pm

Image I just now realized the size difference between our prototypes ( Brass is 7.62X54R) I could probably shoot your hybrid cartridge out of my hybrid cartridge. :lol:
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 19, 2010 5:38 pm

irisher wrote:I could probably shoot your hybrid cartridge out of my hybrid cartridge. :lol:


Definitely :) You could also do more damage just by dropping that thing on the target :roll: :D
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Unread postAuthor: irisher » Mon Apr 19, 2010 5:41 pm

Together we could create a two-stage hybrid for some crazy range :lol:
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Unread postAuthor: CpTn_lAw » Mon Apr 19, 2010 6:17 pm

Have you tried in HGDT using the mix calculator, and reading the chamber post fuel injection pressure? This is how i load mine. It's much more reliable than using the meter separately.
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 19, 2010 11:43 pm

CpTn_lAw wrote:Have you tried in HGDT using the mix calculator, and reading the chamber post fuel injection pressure? This is how i load mine. It's much more reliable than using the meter separately.


I figured 0.4mL for a 5x mix, about right n'est pas?

Together we could create a two-stage hybrid for some crazy range


:D :D :D
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