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P-Mix200

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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P-Mix200

Unread postAuthor: Petitlu » Thu Apr 19, 2012 5:15 pm

Here is a prototype of hybrid high-mix as it will suffer the 200x!
I do not know if it will, we'll see!

Material: it is all-steel high-pressure
Volume: 20cc
Caliber: 6mm
Ignition: resistive

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Unread postAuthor: wyz2285 » Thu Apr 19, 2012 5:41 pm

wow it´s going to be impressive :)
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Petitlu » Thu Apr 19, 2012 5:45 pm

I do not know ... the chamber volume is low ...
But I can increase it easily!
:D
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Unread postAuthor: wyz2285 » Thu Apr 19, 2012 6:03 pm

Have you HDGT it? It is small but mix 200 is high so it should behave like a .22 cal. Also I would suggest hydro test it first according to HDGT's predictions. A resistor while burning will consume oxygen, have that in mind as well when you calculate the mix.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Petitlu » Thu Apr 19, 2012 6:09 pm

I had not thought of to consumption of oxygen ...
I HGDT but it crashes in the chamber to 395bar :(

hese are fitting service pressure of 350bar
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Unread postAuthor: al-xg » Thu Apr 19, 2012 6:15 pm

err... you realise they'd probably have to be rated past 1600bar to take a full 200x mix ?

Larda's hybrid has 15mm thick high strength stainless steel walls...
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Unread postAuthor: Petitlu » Thu Apr 19, 2012 6:19 pm

Yes but the Larda has a big chamber!
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Unread postAuthor: al-xg » Thu Apr 19, 2012 6:25 pm

I think you need to check your GGDT data. 200x will produce a lot more pressure than that if contained and that is for a 20cc chamber...
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Unread postAuthor: wyz2285 » Thu Apr 19, 2012 6:25 pm

But the pressure they produce are the same
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Petitlu » Thu Apr 19, 2012 6:29 pm

then it will explode ... :(
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Unread postAuthor: HunterT » Thu Apr 19, 2012 8:14 pm

I had not thought of to consumption of oxygen ...
I HGDT but it crashes in the chamber to 395bar

these are fitting service pressure of 350bar


Maybe you should try it at 200 bar before going for 300 bar? Don't forget to stack a few sandbags on top of this hybid if/when you fire it.

On another note, I like this one! I'll be interested to see what becomes of this.
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Unread postAuthor: Fnord » Thu Apr 19, 2012 8:42 pm

I was thinking that might be slightly under-built for a 200x gun. Definitely don't stand near it when firing.
If the fittings have a safety factor of 5:1, you're still pretty close to exploding.

Hunter, he's putting 200bar of fuel/air mix in and igniting it, meaning the pressure will jump to something like 1400-1600 bar when it combusts. Not sure if you caught that, just clarifying.
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Unread postAuthor: warhead052 » Thu Apr 19, 2012 9:57 pm

Hmm, I would encase that in something that would absorb the shrapnel in case it exploded. I just get the feeling, after seeing Larda's hybrid, that this won't hold up to as much pressure. Try it with a 100x mix before 200 just to get a general idea of the force its going to be shooting.
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Unread postAuthor: Technician1002 » Thu Apr 19, 2012 11:08 pm

Be aware of the fuel used. If you are too concentrated at high pressure, the fuel may condense into a liquid.

On the ignition, if you use a relatively inert material, you can ignite the gas without burning the igniter and consuming the oxygen. Platinum wire, gold wire, and a few others are good candidates for ignition for metal wire, and Silicon Nitride is a good semiconductor. Unfortunately the nitride may be single use due to the explosion. This material is often used as an igniter in natural gas appliances.

Another solution is to use very little material as an igniter, so when it does burn, it consumes little oxygen. A very fine thread of copper wire works well when hit with a photo flash cap so it instantly vaporizes and starts the fireball.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 19, 2012 11:41 pm

Petitlu wrote:then it will explode ... :(


Wrong smiley :D

hehe the hybrid bug has really bitten you eh! You will really have to sort out your ignition for this one. Be safe!
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