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Hypervelocity Advanced* Combustion - WARTLv1

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: SpudBlaster15 » Fri Sep 23, 2011 5:25 am

inonickname wrote:
SpudBlaster15 wrote:
inonickname wrote:Ignoring oxidizer, graphite will yield 72.9 MJ/L, compared to 83.8 MJ/L for aluminium. Comparing the masses of aluminium oxide and CO2, I'd suggest graphite to be a better propellant if you could find a suitable oxidant. Water could even work with the kind of input energies you're dealing with I suppose.

H<sub>2</sub>O + C -> 1.9kJ/g

H2O2 of reasonable concentration would be a good oxidant for either aluminium or carbon. Peroxide watergels make respectable HE's at decent concentrations too. Of course H2O2 distillation can be tricky and unsafe, and you of course have the issues with dangerous materials if you try buy it. There's a world of oxidizers out there that could be made to work though.

The highest concentration I've been able to locate on retail store shelves in this country is 12% H<sub>2</sub>O<sub>2</sub>, sold as 40 volume hair bleach. It's 3:00am, so I may have royally fudged the calculation, but 12%/V hydrogen peroxide/carbon will still be endothermic with an enthalpy change of 0.76kJ/g.

Boiling to concentrate is certainly a possibility, but DYI could always just get my friend SWIM to send him a bottle of his 35% H<sub>2</sub>O<sub>2</sub>. :D Unfortunately, even 35% H<sub>2</sub>O<sub>2</sub>/carbon isn't going to be very energetic at -1.65kJ/g.

In either case, the oxidizer would probably require distillation to 50%+ to be usable with graphite. Probably not a good idea for someone in DYI's situation to be storing high concentration peroxide anyway.

I managed to get to the sulfate salt, but my yields were poor due to the low concentration or the NaClO I used. I verified it with a silver mirror test with AgNO3. I'm not sure I'm game to do an anhydrous distillation from the salt, even though it's an easy process. I'm sure Spud and DYI understand the hesitation.

Looking forward to seeing some 1kg Astrolite charges in the near future. :wink:
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 23, 2011 5:32 am

SpudBlaster15 wrote:The highest concentration I've been able to locate on retail store shelves in this country is 12% H<sub>2</sub>O<sub>2</sub>, sold as 40 volume hair bleach.


I only use it for "boring" forced degradation testing though.
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Unread postAuthor: Zeus » Fri Sep 23, 2011 7:02 am

Ino, Hydrazine is a carcinogen though, it making the most powerful non-nuclear energetic isn't worth it.


Good luck with your synth, I look forwards to your results. You'll have a PM in a few minutes too.

Edit: You'll find they cast that certain energetic nowdays, higher density.
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Unread postAuthor: inonickname » Fri Sep 23, 2011 8:43 am

I probably wouldn't bother with astrolite g anyway. I've done ETN, could do PETN if I distilled my nitric further, and with a fair bit of work and bother I could do RDX. If I was going to extremes I'd try HMX. Obtaining some cubane would obviously be a pipe dream. There's no real need to bother with astrolites when there's more powerful and safer compositions around.

However, there's plenty of other uses. I'm sure if you didn't have the fear of the law getting up in your grill you'd find some uses DYI... :wink:

Edit: Ideally the peroxide would be at 90%+. However I doubt you could load the chamber without an explosion taking place, and minor spills would result in rapid oxidation to say the least. I've heard of H2O2 stills exploding for nearly any reason...a single spec of dust is sometimes enough to help bridge that activation energy.

Oh if only my chemical lab was stocked a bit better. We need to win the lotto DYI. And you spud.
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Unread postAuthor: Crna Legija » Fri Sep 23, 2011 9:10 am

inonickname wrote:/img]We need to win the lotto DYI. And you spud.

that would make a very nice video :lol:
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