lacrima97 Posted June 15, 2006 Posted June 15, 2006 Urea is in some instant cold packs right? I am attempting to make methyl carbamate but am having trouble finding urea anywhere. Oh, and there is a person who goes by jungle1 at totse. I have nothing against this person but don't want to be mistaken for him.Yessir, some of the cold packs are indeed urea, while some are ammonium nitrate. You just have to read the package to tell the difference I suppose. Ive seen alot of the cold packs for sale online, and if your in the US, im sure you wouldn't have a problem ordering some.
kiknet Posted June 15, 2006 Posted June 15, 2006 Urea is in some instant cold packs right? I am attempting to make methyl carbamate but am having trouble finding urea anywhere. Oh, and there is a person who goes by jungle1 at totse. I have nothing against this person but don't want to be mistaken for him. Have you tried gardening sections of some stores? This big hardware warehouse didn't have any but I found some in the garden section of my local supermarket.
justanotherpyro Posted June 16, 2006 Posted June 16, 2006 Can parlon be substituted for saran resin? I can never remember what chlorine donors are interchangeable, and how.
Mumbles Posted June 16, 2006 Posted June 16, 2006 Parlon for saran, not so much. PVC for saran you can do though. Well, you can substitute Parlon for PVC, so therefore you should probably also be able to do Parlon for Saran. It may require extra priming. Parlon mixtures take fire less easily than PVC or saran.
d4j0n Posted June 16, 2006 Posted June 16, 2006 Maybe I should have bought pvc instead of parlon then... Anyway, does anyone know of how to make crackle paper? All I have seen is a video of it.
fredjr Posted June 16, 2006 Posted June 16, 2006 Just got a newlsetter from http://www.fireworksalliance.org. They are working to protect our rights to have our hobby. So if you haven't already joined please do so. The newsletter has a link to this story in Wired, that is worth reading if you haven't already seen it.
AreteVeteran Posted June 17, 2006 Posted June 17, 2006 Urea is in some instant cold packs right? I am attempting to make methyl carbamate but am having trouble finding urea anywhere. Oh, and there is a person who goes by jungle1 at totse. I have nothing against this person but don't want to be mistaken for him. I thought you were jungle1... Do you have a totse account, or do you just visit some times? /AV/
BigBang Posted June 17, 2006 Posted June 17, 2006 Well, I've been gone for a bit (like anyone noticed/cared ) and only get to be online for a few tonight. Things are going well for the fourth. I have 20 waterfall tubes made and primed, and will finish the final 20 soon. I am making a few 3" shells, but only have 2 ready at the moment, I have been lazy with the stars. The first one has akwapo stars and the second is a Ti ariel salute. I tried coating the inside of the hemi's with Ti, so I hope it makes a nice ball of sparks, and not just a bang. Still more is on the way, just have to keep working. To whom posted about the popcorn effect some pages back, Crazy Swede posted an excellant reply in the thread at the old forum. I have been wanting to try this and just never got around to it. I want to make a star roller before I try, as I dont want to try handrolling these. This is the post:Popcorn.pdf
Mr. Crackle Posted June 18, 2006 Posted June 18, 2006 Do you have a totse account, or do you just visit some times? /AV/I just visit some times. And to fulfill the random part of the post...Rockstar energy drink is the best.
_DB_ Posted June 19, 2006 Posted June 19, 2006 I learned something today..... meatballs are an absolute bitch to make! But they taste so good. I'd also like to take this moment to say that my sister's boyfriend has the sweetest car ever. Man is it sweet!
lacrima97 Posted June 19, 2006 Posted June 19, 2006 Do you guys think that I got a good deal? I just bought a 500g/.1g digital scale with backlight and stainless steel top, + calibration weight for 26 bucks. My old scale is going to break down soon, so I figured I'd go ahead and get another one since the biggest time of the year is coming.
Mephistos Minion Posted June 19, 2006 Posted June 19, 2006 Good enough deal, I paid $40 for scales with those specs here in AUS, and got my new ones in London for 20GBP. EDIT: Huzzah, 150.
lacrima97 Posted June 20, 2006 Posted June 20, 2006 I dont understand why flash powder is an LE. It seems that anything that burns subsonically would be an LE, which is what, about 300-340mps. It seems that any explosive with a vo(d?) of over 340 would be an HE. Why is this not the case? The definitions of things I have found says that the material (LE) burns at 'sub-sonic' speeds. I think that if you could say flash powder had a vod (?), that it would definately be over 300. So why is it not an HE?
BigBang Posted June 20, 2006 Posted June 20, 2006 The trick is velocity through the substance itself. A HE has a front which travels faster than the speed of sound though the substance being detonated. An LE is a subsonic front though the substance. You gave the speed of sound through the air, not through the substance itself. When we look at the speed of sound through flash powder, it is infact a higher velocity than the speed of the burning front.
lacrima97 Posted June 20, 2006 Posted June 20, 2006 Oops, I forgot about that part. Lol, flash powder isn't made of air, duh. Thanks.
optimus Posted June 20, 2006 Posted June 20, 2006 Tonight, my friends, I present a small medley of my most recent pyro escapades. The rockets are all 1/2" ID coreburners. Two with flying fish/falling leaves, and two with plastic 1-3/4" plastic ball shells. There's also a crappy mine in there. Enjoy ballrocket 1flying fishmine and better ballrocketfalling leaves
_DB_ Posted June 20, 2006 Posted June 20, 2006 In the mine video it looks like someone was standing dangerously close to it. Probably just an illusion.
optimus Posted June 20, 2006 Posted June 20, 2006 Yup - that's me, and I'm pretty sure I was a safe distance away from the thing... I appreciate the conern though
_DB_ Posted June 21, 2006 Posted June 21, 2006 Your welcome. You gotta look out for your fellow pyro. Anyway I came across this and it is just way too much fun - Virtual Drumset
justanotherpyro Posted June 21, 2006 Posted June 21, 2006 I think PVC primer probably works the best. It has acetone and MEK in it. After I put a generous amount of primer to seal up the shell, I put some on the outside as well. After that's somewhat dry I cover the outside seal again with PVC glue to reinforce and prevent gas leaks. Works great.I tried this and it drastically improved the break of a 3" plastic ball shell. Thanks for that PyroJoe
Pretty green flame Posted June 21, 2006 Posted June 21, 2006 Anyone else got a messege from you MSN account that MSN will be shuting down some time soon. Is this true or is it spam.
Mumbles Posted June 21, 2006 Posted June 21, 2006 Sounds like spam. In other random news, today begins my marathon 4th of July manufacture session. One star I am using has both lampblack and -325 mesh bright flake Al. That one should be fun stuff there. All in all, I think I will be making around 2-3 kilos of stars, and probably a kilo of burst. The piece de resistance shall be a 5" crown brocade. It would be bigger, but 5" is the biggest mortar I have.
justanotherpyro Posted June 21, 2006 Posted June 21, 2006 My 4th of July marathon manufacture has been going on since the beginning of June . I am new to colored stars as I wanted to get good at shell building before I used a good chunk of money to buy chems, so I have tested so many comps and have pretty much learned star rolling the last few weeks. Hopefully all with good results for the 4th. On a side note. Does priming 1/4" time fuse work as well as cross matching, or is it just safer to cross match?
inkjet Posted June 21, 2006 Posted June 21, 2006 Ok, recently I have been messing with little quarter inch rockets. A while ago, before I had a ball mill, i used homemade tubes and screened BP. I either used 6-1-1 or 75-15-10. So now, i get my order of pyrotube quarter inch tubes and finally get a ball mill. So I mill up some 75-15-10 BP and make some rockets. I use a tooling set i had made for me. Before, the rockets would make a loud hiss and fly high in the air. Now, no matter what i do, they explode. I thought I had made the nozzles too thin, so i made a thicker nozzle and it exploded pretty loud for a quarter inch rocket. I am guessing the fuel is too hot, but on a thread in rec.pyrotechnics where i was asking why my rockets were too slow (i fixed that later), someone said he had never been able to cato a quarter inch rocket, even with commercial BP. I used white pine for my BP and it burns very quickly. Also, i used to fuse with homemade blackmatch, but with my 1/4 tubes, i also got some chinese firecracker fuse and 1/16" fuse which i use now. Next up i'm going to try to mill some 6-1-1 BP for about 20 mins and try that as a fuel. Any suggestions?
Pretty green flame Posted June 21, 2006 Posted June 21, 2006 Ok, recently I have been messing with little quarter inch rockets. A while ago, before I had a ball mill, i used homemade tubes and screened BP. I either used 6-1-1 or 75-15-10. So now, i get my order of pyrotube quarter inch tubes and finally get a ball mill. So I mill up some 75-15-10 BP and make some rockets. I use a tooling set i had made for me. Before, the rockets would make a loud hiss and fly high in the air. Now, no matter what i do, they explode. I thought I had made the nozzles too thin, so i made a thicker nozzle and it exploded pretty loud for a quarter inch rocket. I am guessing the fuel is too hot, but on a thread in rec.pyrotechnics where i was asking why my rockets were too slow (i fixed that later), someone said he had never been able to cato a quarter inch rocket, even with commercial BP. I used white pine for my BP and it burns very quickly. Also, i used to fuse with homemade blackmatch, but with my 1/4 tubes, i also got some chinese firecracker fuse and 1/16" fuse which i use now. Next up i'm going to try to mill some 6-1-1 BP for about 20 mins and try that as a fuel. Any suggestions? Dude, quater inch rockets are supposed to be nozzleless rcokets so no clay nozzles, just ram the fast BP propellant and they'll fly.
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