Jordan Posted June 12, 2014 Posted June 12, 2014 (edited) Can somebody post the composition for win39j as well as a burn rate table for 1lb. Motors? Edit: Burn rate for the delay not rocket fuel for 1lb. Motors Edited June 12, 2014 by Jordan
nater Posted June 12, 2014 Posted June 12, 2014 Winokur 39J Potassium Nitrate - 51Airfloat Charcoal - 19Antimony Trisulphide - 12Atomized Aluminum 120-325 mesh - 9Barium Carbonate - 5Dextrin - 4Magnalium -60 mesh - 2.5 Sorry, I don't have the burn rates handy.
VikingPyrotechnics Posted June 12, 2014 Posted June 12, 2014 2 -3 seconds per 3/4". depends on how well you mix the comp :-)
Zmuro Posted June 12, 2014 Posted June 12, 2014 Could I replace barium carbonate with strontium carbonate or sodium carbonate, bicarbonate?
Zumber Posted June 12, 2014 Posted June 12, 2014 Could I replace barium carbonate with strontium carbonate or sodium carbonate, bicarbonate?you can not replace it with sodium carbonate or sodium bicarbonate. if you want you can try other formulas. here us the link http://www.amateurpyro.com/forums/topic/67-winokurs-40-glitter-compositions/?hl=glitter
Mumbles Posted June 12, 2014 Posted June 12, 2014 You could replace it with strontium carbonate or sodium bicarbonate, but the effect will be different. Win 39 is quite a unique effect when done right, so these modifications may kill it.
ddewees Posted June 12, 2014 Posted June 12, 2014 Speaking of 39J, I noticed Tom joined APC yesterday...
VikingPyrotechnics Posted June 13, 2014 Posted June 13, 2014 Speaking of 39J, I noticed Tom joined APC yesterday... Big Brother is watching you :D
kaotch Posted June 13, 2014 Posted June 13, 2014 I would advise to omit the dextrin and replace 1:1 with Red Gum.
TYRONEEZEKIEL Posted June 13, 2014 Posted June 13, 2014 By Tom, do you mean Tom Rebenklau? Is he the guy that made 39j?
Mumbles Posted June 13, 2014 Posted June 13, 2014 I would advise to omit the dextrin and replace 1:1 with Red Gum. I would advise not to do that. Red gum will kill more glitters than it allows. For a delay you don't need any binder whatsoever anyway.
ddewees Posted June 13, 2014 Posted June 13, 2014 By Tom, do you mean Tom Rebenklau? Is he the guy that made 39j?Yes
marks265 Posted June 13, 2014 Posted June 13, 2014 How come people think red gum is like ketchup, which is/has been put on almost everything?
Bobosan Posted June 13, 2014 Posted June 13, 2014 (edited) Nasty stuff, that red gum is. Goes everywhere. Kind of like thermal heat sink paste for electronic use. Edited June 13, 2014 by Bobosan
MrB Posted June 14, 2014 Posted June 14, 2014 How come people think red gum is like ketchup, which is/has been put on almost everything?Wait... Your saying it isn't? If the color is right, and the consistency... Put it on your pasta, don't spend to much time tasting it. Actually. I think it's simply down to it's properties as both a fuel, and a great binder. I prefer to use straight water as a binder, or water / alcohol when i need something with a lower surface tension... So redgum wont work for me. But it IS great. Almost like ketchup.B!
ddewees Posted June 14, 2014 Posted June 14, 2014 If red gum is ketchup, what's phenolic resin... A1?
nater Posted June 14, 2014 Posted June 14, 2014 I don't know about that. To me, phenolic resin smells like it has a hint of menthol like the Chloraseptic spray for sore throats.
ddewees Posted June 14, 2014 Posted June 14, 2014 Ha... that's the smell. It's been driving me crazy trying to remember where I've smelled that before. I always hated that spray stuff...
marks265 Posted June 15, 2014 Posted June 15, 2014 I'm cheap because I'm a "user"! Dextrin and water are cheap for a binder and a solvent respectively, and work very well, alcohol and red gum are not.
nater Posted June 15, 2014 Posted June 15, 2014 I am now a convert to phenolic resin and alcohol for my color stars. I am finding it to be a superior fuel to red gum and a great binder. I use dextrin and water for charcoal stars, cheap and effective.
WSM Posted June 19, 2014 Posted June 19, 2014 (edited) Could I replace barium carbonate with strontium carbonate or sodium carbonate, bicarbonate? I was making 3" comets with a variation of 39J (oh so many years ago) and had only half enough BaCO3. I made up the difference with SrCO3 and pressed the comets. When fired, the comets performed very well, but with a subtle surprise. When two of them were attached to a 12" shell for a rising effect, I thought I could see the tiniest little red and green flashes in all that white glitter, and wondered if I was imagining it, when someone came up behind me and asked, "Are those red and green flashes in that glitter?!" I would avoid sodium carbonate in glitter compositions in any case because it's strongly alkaline and will attack the aluminum. WSM Edited June 19, 2014 by WSM
dangerousamateur Posted June 21, 2014 Posted June 21, 2014 (edited) When you use W39j for your delays, how do you prepare it?With or without binder?Riced with water?Do you ballmill the composition, at least the BP parts?And how must the charcoal be, a fast one or a slow one? Edited June 21, 2014 by dangerousamateur
ddewees Posted June 21, 2014 Posted June 21, 2014 (edited) TR only uses commercial hardwood airfloat charcoal... so nothing special. Since you asked for using it as a rocket motor delay, the binder isn't necessary. I would screen all the ingredients (except the mg/al) through a forty mesh screen, until mixed well. Then add the mg/al and mix/stir. You can press dry. Edited June 21, 2014 by ddewees
nater Posted June 22, 2014 Posted June 22, 2014 I prefer to granulate all of the comps that I end up pressing, it makes the process much less dusty and I think granulated comps press into a better grain. A binder isn't necessary, just dampen the comps with water and granulate through a 12-20 mesh screen. I do use a binder, even in rocket delay, but it is not necessary. I think it just makes grains that store nicer without breaking down into dust again.
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