cplmac Posted February 12, 2007 Posted February 12, 2007 I actually thought that was a pretty nice break. Not real big but very good symmetry which is hard with any size, but especially hard with small diameter. Never seen a rock shoot from right to left then rotate to the right quite like that before. Looked nice, google eats your video quality though.
Wyvern Posted February 12, 2007 Posted February 12, 2007 I actually thought that was a pretty nice break. Not real big but very good symmetry which is hard with any size, but especially hard with small diameter. Never seen a rock shoot from right to left then rotate to the right quite like that before. Looked nice, google eats your video quality though. Thanks, having watched your rocket vids that is a wonderful complement, as for the right to left that was the way i filmed it with the camera on its side and didnt rotate the video afterwards. Wyvern
Polumna Posted February 12, 2007 Posted February 12, 2007 hi dudes Nice videos, cplmac and wyvvern, good job!!! polumna
cplmac Posted February 13, 2007 Posted February 13, 2007 I've been working on a composition that hopefully will give an effect similar to a drippy comet. I started with the Purrington gold glitter mix and have been tweaking it to try and get the right effect. I made a three inch mine with about thirty or so half inch stars of this comp. Unfortunately the half inch stars do not give the proper effect, it only really comes off right with pucks of somewhat larger diameters. Anyways, it's a pretty decent mine and somewhat shows the gold glitter at least. Drippy Glitter 3" mine
Mumbles Posted February 13, 2007 Posted February 13, 2007 Are you talking about an effect similar to the breaking glass comets Aaron Enzer had at the PGI this year? If you want it, a certain Montana pyro friend of ours, in his infinite wisdom, have me some hints and formulas for them. Due to a possible motherboard failure, it is safely locked away inside my dead computer. A nice gentlemen from the computer company named Lalit, is going to fix it for me though. I do remember the theory though.
cplmac Posted February 13, 2007 Posted February 13, 2007 Yeah that's what I'm talking about. We actually bought some for our own show last June from one of our suppliers. Anyhow, I'm going to continue to try and develope my own formula, but perhaps I will also give a holler to Montana. Thanks.
Mumbles Posted February 13, 2007 Posted February 13, 2007 The formulas he gave me were for a breaking glass shell. Pretty much the same type of effect, but in shell form. I imagine using a base composition with the different microstars embedded is how it's done. From PML I also deduced that there is no FeTi or Ti in there. Aaron said that it scratches is production tooling as an off hand coment when looking for another composition. I'm trying to find a video so other people know what we're talking about, but I can't seem to locate one. It's a silver streamer/glitter comet that has particles that droop or fall out of the tail and glitter on their own. They look kind of like shards of glass falling through the air, and thus the breaking glass comet. They have to be kind of fired off at an angle for them to properly work.
cplmac Posted February 13, 2007 Posted February 13, 2007 I have several videos of the drippy(breaking glass) comets from our show. I should be able to edit them out of there and post it up. I might try and get the HD version posted. They do need to be shot at an angle to get the best effect. They are basically solid comet cylinders.
cplmac Posted February 14, 2007 Posted February 14, 2007 Here is a high definition video of that last three inch mine. You need windows media player 9 or better to watch it. High Def three inch drippy glitter mine
cplmac Posted February 15, 2007 Posted February 15, 2007 The formula that video was based on is Purrington Gold Glitter:Potassium Nitrate 56Atomized Aluminum 12 or 14 micron 7Charcoal Airfloat 9Charcoal 80 mesh 2Sulfur Flour 15Sodium Bicarbonate 6Dextrin 5Boric Acid 1 I substituted 325 mesh spherical Al for the 12 or 14 micron atomized.
Wyvern Posted February 17, 2007 Posted February 17, 2007 Ive just finished a few coesettes with that formula, ill post the results
cplmac Posted February 17, 2007 Posted February 17, 2007 excellentdid you use the 12-14 micron al or the 325 spherical?
Wyvern Posted February 18, 2007 Posted February 18, 2007 i used the 325 spherical (the only Alu i have atm) but 2 failed attempts so far, the lift has blown the xettes apart each time, i think it might be time for a propper press (rather than a vice)
cplmac Posted February 18, 2007 Posted February 18, 2007 The vice should be strong enough. What size are the xettes? What percentage of moisture are you using and what are you using for moisture, ie water, alcohol etc..
Wyvern Posted February 18, 2007 Posted February 18, 2007 they are 20mm xettes Im using a 50/50 Alc/water mix and wetting about 5%, but that certainaly is a lovely looking comp although my charcoal gives it a darker red than the one in the video
Mumbles Posted February 19, 2007 Posted February 19, 2007 I would move to straight water. I suspect the binder is not being properly activated due to the very low percentage of water (~2.5%), and thus they're not strong enough to survive the lift. It will help with a more symetrical break as well.
Mardec Posted February 19, 2007 Posted February 19, 2007 Sorry if this is posted in the total wrong tread but I have a question. My rocket tool will arive soon and I was thinking about propellants. It will be basic Meal (or something like it) with a added fuel.This will we C or Al or Fe or Zn of Mg. Or a mix of them all. But since some compositions are unsafe to ram I would like to know wich comps are dangerous to ram. With carbon it will be safe but how about the other ones? I don't know if it is important, but my ram will be made out of aluminum.
Wyvern Posted February 19, 2007 Posted February 19, 2007 i would advise against ramming anything that contains metal powders, if you are i would use Al but cetainally not any other metals. Mumbles, thanks for the advice, ill use plain water in my next batch, also is there a type of charcoal which produvces a more golden tail as i find my willow is very red when it burns.
cplmac Posted February 20, 2007 Posted February 20, 2007 It was a 1.25" comet. Weighed about 35 grams.
h&k machineguns Posted February 21, 2007 Author Posted February 21, 2007 4oz whistle rocket ( 15 grams of fuel total ) with 95 grams as a payload. Not real high,but it's impressive weight to lift for only a .5" ID rocket that's 4" long. http://youtube.com/watch?v=fhfl9MRPEMY
ewest Posted February 21, 2007 Posted February 21, 2007 Dang H&K that was a lot of smoke, what'd you use for a report? Regular BP doesn't put out that much smoke LOL. I love the rocket btw.
h&k machineguns Posted February 21, 2007 Author Posted February 21, 2007 Dang H&K that was a lot of smoke, what'd you use for a report? Regular BP doesn't put out that much smoke LOL. I love the rocket btw. 70/30
cplmac Posted February 22, 2007 Posted February 22, 2007 It was a 1.25" comet. Weighed about 35 grams.Looks much bigger in the vid. I assumed about 3". Very good yield of light. Did you use the above posted formula? Same formula. I would like to get some larger comet tooling, but for now that is the biggest I go. HK that had a cool stutter to it. I have gotten that sound with wet fuel before and sometimes Ti. 95 grams is a lot of report for a 4oz rocket, I loved it.
h&k machineguns Posted February 23, 2007 Author Posted February 23, 2007 It was a 1.25" comet. Weighed about 35 grams.Looks much bigger in the vid. I assumed about 3". Very good yield of light. Did you use the above posted formula? Same formula. I would like to get some larger comet tooling, but for now that is the biggest I go. HK that had a cool stutter to it. I have gotten that sound with wet fuel before and sometimes Ti. 95 grams is a lot of report for a 4oz rocket, I loved it. What's weird as that my whistle rockkets never make that studdering sound,and only 2 have done it.The first was the little 4 oz rocket in that video carring up all that weight,and another rocket that was a 1 pound whistle rocket that I got to carry up a 4 pound water payload to 100-125 feet. I think the studder sound comes from the whistle rocket releasing all of it's thrust at such a slow and low altitude.
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