vh718 Posted August 22, 2011 Posted August 22, 2011 okay so i have a couple of questions about this chinese comp Timed Rain Willow kno3 22MgAl 10Sulfur 15Cuo oxide 10charcoal 20Ti 15dextrin 8 1. will this actually crackle like a dragon egg or is this just a base mix for like a matrix star?2. does the cuo oxide used matter, because i have cuo (II) oxide black?3. im guessing the MgAl should be like 100-200 mesh, right?4. is it safe to bind with water? yes i know you bind dextrin with water but your can never be too safe. Thanks, vince
Mumbles Posted August 23, 2011 Posted August 23, 2011 Time rain is just an invented chinese term for crackle matrix comet. I'm going to start with 0 0) That formula is probably fake/wrong 1) See 0. It looks to me as if they possibly just listed all of the component of the mixture, and conveniently forgot about the preparation, if we assume the formula is even right. At many other places in the formulas it lists crackling at 70% CuO and 30% MgAl, or at 34 CuO (~64%) 19 MgAl (~36%). This may be another spot where they "forgot" about any other oxides such as lead or bismuth they may also be using. I'd look at it more like this:Base:KNO3 22MgAl 6Sulfur 15charcoal 20Ti 15dextrin 8 Crackle:CuO - 10MgAl - 4 (an approximation from the crackle amount) As is however, the basemix looks like it would barely burn. If you double the KNO3 you get something more in the ball park. 2) Most of the time when something calls for copper oxide, it will be CuO, black copper oxide. Red copper oxide is rare enough it should be specified if needed. you never know with these chinese formulas though. 3) That is something that needs to be dialed in. I had the best success with crackle using mostly -60 mesh, though I've seen people make them with all -200 mesh too. There may very well be a mixture of meshes in there for the crackle or comet, or whatever else. 4) If they're typical matrix comets the crackle is bound with nitrocellulose, and then pressed into the water wet base comet mix. If you'd like to compare, there is a well established mix in Hardt.
vh718 Posted August 23, 2011 Author Posted August 23, 2011 thanks for the info mumbles, you saved me from a waste of chems
Mumbles Posted August 23, 2011 Posted August 23, 2011 It always seems like there is quite a bit more crackling in the comet videos I've seen than there maybe should be. It might just be an illusion. Two ways this could be done would be to make a crackle that pops several times per granule, which is most easily done by using finer MgAl. Another way would be to use a coarser MgAl in the base comet mix. It has a tendency to sort of sizzle on it's own.
dan999ification Posted August 23, 2011 Posted August 23, 2011 ive been toying with c6 and 10-20% 60-300 mesh mgal, crackles/sizzles on its own but you wouldnt hear it past 50 ft some dragons egg would beef it up a bit, or if your interested ill dig out the comp for pop glitter, crackle and glitter all mixed up. dan.
Mumbles Posted August 23, 2011 Posted August 23, 2011 I think you're underestimating what I meant by coarse. I was thinking more in the 20-30 mesh range. That you can hear from a fairly sizable distance. Even if it's only adding to the background noise, it'd still be filling it out.
Algenco Posted August 23, 2011 Posted August 23, 2011 I use 10-30 mesh MgAl in 3" comets that sizzle loudly at 400'
vh718 Posted August 23, 2011 Author Posted August 23, 2011 ive been toying with c6 and 10-20% 60-300 mesh mgal, crackles/sizzles on its own but you wouldnt hear it past 50 ft some dragons egg would beef it up a bit, or if your interested ill dig out the comp for pop glitter, crackle and glitter all mixed up. dan. ya can u give me the comp
dan999ification Posted August 23, 2011 Posted August 23, 2011 ive been toying with c6 and 10-20% 60-300 mesh mgal, crackles/sizzles on its own but you wouldnt hear it past 50 ft some dragons egg would beef it up a bit, or if your interested ill dig out the comp for pop glitter, crackle and glitter all mixed up. dan. i did not mix up what you said just added my own 2 cents, and had i known that time rain was apparently exclusive to 3" comets wouldnt have mentioned a test comp that you MAY not be able to hear past 5o ft.and understand that larger chunks of mg/al 10-30 mesh will be considerably louder than 60-300.sorry for the misunderstanding. dan.
Mumbles Posted August 23, 2011 Posted August 23, 2011 The comet size really has no impact on how far away you can hear the sound. I'd bet FSOY (flaming shit on you) would also make a decent sound in the air. I didn't mean to come off as condescending if that is what you thought. I was just trying to clarify that when I said coarse MgAl, I meant REALLY coarse.
Bonny Posted August 24, 2011 Posted August 24, 2011 I use 10-30 mesh MgAl in 3" comets that sizzle loudly at 400' What is the base comp on those comets?
dan999ification Posted August 25, 2011 Posted August 25, 2011 ya can u give me the comp hope its ok here, i havn't actually tried this comp [ no stibnite ] 45% kno314.3% sulphur8.8% airfloat charcoal10.5% antimony trisulfide 14% 200 mesh mg al4.5% copper oxide4% dextrin dan.
allrocketspsl Posted August 25, 2011 Posted August 25, 2011 alot of winokurs comps crackle quite alot,I know w5,w19,w2 does alot
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