lokys Posted November 24, 2009 Posted November 24, 2009 (edited) hello! This is my home made dragon egg`s And here is my star mine D1 Glitter to D.Eggs : http://www.youtube.com/user/Rimokas99#p/a/u/1/MlCancj-fvA Edited November 24, 2009 by lokys
Karlos Posted November 24, 2009 Posted November 24, 2009 (edited) What about technology.... NC? small cut? Edited November 24, 2009 by Karlos
lokys Posted November 24, 2009 Author Posted November 24, 2009 (edited) Yes, I used home made NC (acetone and Ping Pong balls (table tennis)) .. I'm just pushed composition during 10 mesh net. understand ? I primed stars with greenmix + 4% Al flake (600mesh) in real, eggs explodes wery loud. Sorry my english is not wery well, if you have any questions, ask, i'll try to answer. Edited November 24, 2009 by lokys
Karlos Posted November 25, 2009 Posted November 25, 2009 What about another binder than NC? Maybe, small cut stars 3 mm will work better. Acetone evaporate from composition wery guick, and composition is brittle. I tryed 5% of resin and alcohol and composition crackled too. Maybe red gum can be good binder too.....or not?
lokys Posted November 25, 2009 Author Posted November 25, 2009 I don`t know, i just tryed NC.. In tutorial ,which I used, was written that like binder need NC.. i haven`t try any others binders.. and red gum is more expensive than NC .. I never had tryed ,, cut stars technology'' . maybe it would be better.. but for me enough my technology
PyroMan LTU Posted November 25, 2009 Posted November 25, 2009 Karlos, they shouldn crack when acetone evaporates. I never tried them, but if so, then try higher consentration of NC paste. And I believe there is no need to make DE big such as 3 mm cut, since they crack very loudly if even if they're small so I dont know if it is nessesery to make them big. PyroMan
Karlos Posted November 26, 2009 Posted November 26, 2009 Pyroman: maybe yes. I hawe been interested(not lot ago) in rain willow from China. I thought, that stras are made from special composition. Just I know, that contain crackling granules, because i seen many videos and special one, with green crackling palm. Really, this is black powder formula with crackling microstars, but I dont know how(size) od granules and percentage in stars. Perfect 6' shell pyroman! nice crackles.
PyroMan LTU Posted November 26, 2009 Posted November 26, 2009 Hey, thanks Yes - those are some nice crackling stars, when I get my Pb3O4, I will try them in diffrent combinations. Then, I will be able to say sth about them... Good luck! PyroMan
rjogden Posted November 30, 2009 Posted November 30, 2009 Maybe, small cut stars 3 mm will work better. For Dragon's Eggs, smaller is better. The whole particle rarely explodes if you make it larger, though sometimes I have gotten a multiple pop from a single larger particle.
lokys Posted December 2, 2009 Author Posted December 2, 2009 Which formula did you use? Pb3O4.............................................81.8Mgal 200mesh ...................9.1CuO ...................................9.1
Yafmot Posted December 22, 2009 Posted December 22, 2009 I'm kinda' short on Mg right now, so I'm wondering if maybe I could get by with Al. The closest I've seen in any literature is Magnalium, and I've gotten that to work just fine, but nothing was said about just Aluminum. They didn't say you couldn't, they were just silent on the subject. Also, I've only used Bi2O3. I've already been exposed to enough heavy metals in my lifetime. The only Al I have right now is about 5 micron dark stuff. The MgAl I was using was about 160-200 mesh, IIRC. I seem to recall something about particle size being a critical factor. I know that the actual size of the microstars is best kept around one to two mm, and I think I have a pretty solid theory about why. If the stars are too big, you're just wasting comp, because one zone of the mass will heat up faster than another, and only the portions which have reached that critical temperature will actually react. The rest just goes flying off. If a way to heat a large quantity of the comp isothermally could be found, it would be interesting to try, just to see if a correspondingly bigger reaction would result. I think slow heating to the critical temp would probably be a little more controllable, as well as a little more measurable. Just dumping BTUs into it probably won't tell too much. Flash or thermite definitely have the caloric value, but would be like killing a roach with a grenade in an application like this. Some kind of heated pressure vessel with some really fine thermal control. Just a couple of thoughts.
Mumbles Posted December 22, 2009 Posted December 22, 2009 Stars upwards of 1/4" can be made of dragon egg composition if you take care in selecting formula, mixing, and priming. You are right about the MgAl particle size, it plays a critical role. With the MgAl you have 1-2mm is the max, but with 60 mesh MgAl, you can approach 1/4" like I said before. I like to think of it as the the reaction outruns the delay. With too large of stars, you will get a sizzling, as the broken off pieces complete the reaction. I don't know if straight Al or Mg will work. I have heard that 70/30 Al/Mg is ideal for this composition. Others (mike swisher), have stated that the alloy is required for the reaction. Mg smoulders with the oxide, and the Al gives the thermitic explosive reaction. This raises several questions in my mind, but I will accept it for the time being. Namely, why would the more reactive metal only smoulder, as the less reactive metal reacts explosively. Even if it is the Al providing the smoulder, why would the less reactive metal react first? I proposed a question to him about intermediate oxidation states. All of the common materials, Pb3O4, Bi2O3, and CuO, have intermediate quasi-stable oxidation states between the oxide and free metal. Mr. Swisher claimed, a successful reaction was possible with litharge, the intermediate state I had in mind. Given this fact, it should in theory be possible to make eggs from only a pure metal.
gordohigh Posted March 20, 2010 Posted March 20, 2010 Yafmot, there is a thread on here about making your own magnalium by melting scrap alu and mag. Once you have yielded the ingot from your melt, it breaks up like glass and is fairly fast to mill in a ball mill. Just be sure to use a seperate container and milling media so as to not contaminate any of your other chems. The pyroguide formula I used for making bismuth dragons eggs actually called for +5% alu powder and I can attest to how well that formula works, although I haven't tried any in a shell yet so I'm not sure of how well they will light. I was thinking about maybe using some silicon powder in my prime but need to research that some more. As far as the size of these little jewels, I pressed mine thru a 14 mesh screen but the commercial ones I have in some crackling fuse were round, as if they were rolled. They are smaller than a BB but I was amazed at how consistant the size was and again, they were perfectly round. I'm sure they screened them for the size but I wonder what they used for a core to roll them. (thinking out loud)
due559 Posted March 20, 2010 Posted March 20, 2010 (edited) Has anyone ever tried making dragon eggs with 325 mesh mg/al? Is there any reason why it wouldn't work? EDIT: Scratch that, found out a lot at http://www.creagan.net/fireworks/dragonseggs.html Edited March 20, 2010 by due559
50AE Posted March 21, 2010 Posted March 21, 2010 I have and they didn't work for me. They just smouldered and popped, without a bang.
50AE Posted March 22, 2010 Posted March 22, 2010 I tried two compositions, the one had only Pb3O4 and MgAl, the second had also copper oxide. They were binded with a dinitrocellulose in acetone solution.
Pyro09 Posted March 22, 2010 Posted March 22, 2010 Yesterday I made a batch of Pb3O4-Dragoneggs, and they are really loud! It is the composition which is listed at pyroguide.com (containing Kno3, CuO and S). Does anybody know why dragon eggs explode so loudly? I can't imagine which chemical reaction leads to the loud cracks.. Would be nice to know!
xetap Posted March 22, 2010 Posted March 22, 2010 It's fairly common knowledge that magnalium 50/50 is the alloy preferred for making dragon eggs. Just Al or just Mg won't work- you will get a white star. AFA mesh size of the magnalium, I've made eggs w/the finest magnalium I have- something on the order of 600 'mesh'. Mostly, there are more, closer spaced reports and the eggs are somewhat easier (quicker) to ignite. The comp I use is:Red lead............70Magnalium.........17.5CuO black..........12.5Bound w/NC lacquer. I'm going to make a small batch w/Mg and Al mixed 50/50 w/o alloying- just the two elements mixed by screening- to see how well (or IF) it works. IIRC, I read somewhere that it would work, but I'm fixing to see for myself.
Pyro09 Posted March 22, 2010 Posted March 22, 2010 I used selfmade MgAl, I just put it in my blademill and ran it through a sieve ( I don't know the exact mesh size, but should be around 100-120 mesh). It works fine!
xetap Posted March 22, 2010 Posted March 22, 2010 Dragon eggs made w/ Al and Mg as separate elements added together did not produce a usable effect. The ignition was the same as usual, but had only a small crackle effect. Burned bright, obviously- but not as a dragon egg. The mesh was very fine, dark pyro-fine, actually. In the same mesh, magnalium worked, although the reports were closely spaced together as might be expected from a mesh size finer than 200.
Mumbles Posted March 22, 2010 Posted March 22, 2010 The original effect was made using a different alloy than 50/50. There are some mixes that use a few parts of atomized Al IIRC, that some claim to be louder. I have been under the impression that MgAl alloy is critical to the effect, but it can somewhat be tuned by the addition of small amounts of pure Mg or Al.
xetap Posted March 23, 2010 Posted March 23, 2010 In a conversation w/Lloyd S. @ recpyro, he indicated that using an excess of Mg would cause an increase in frequency. His thoughts were, there's more Mg "presented" at the surface of smaller mesh magnalium, and Mg is what's consumed during the smoulder phase, so "having too much of it (Mg) present results in a very rapid smoulder that spawns multiple little cracks that sound like an errant electric arc." That "electric arc" is what I've been trying to recreate, I made it accidentally only once. I just got some Mg to use for this, but I havent tried adding a small percentage to the standard dragon egg comp to see what the results will be. Lloyd had the same 'problem' w/a batch as I was trying to make on purpose. His problem turned out to be a batch of magnalium that was 65/35 Mg/Al instead of 50/50.
QED4803 Posted April 11, 2010 Posted April 11, 2010 hello! This is my home made dragon egg`s And here is my star mine D1 Glitter to D.Eggs : http://www.youtube.c...u/1/MlCancj-fvA Very nice! Was the D1 rolled on dragon rgg centers? Can anyone tell me if it's safe ro pump stars or gerbs w/ DE? Any special considerations or precautions?
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