Pretty green flame Posted January 2, 2007 Posted January 2, 2007 WOW, damn good shells. Break are massive for 3 inchers, any flash booster, if so how much. Cheers and keep up the excelent work!
Pretty green flame Posted January 3, 2007 Posted January 3, 2007 Siffup, i forgot to ask, what was the formula for the stars in the first shell in the 6shot clip, it looks very cool. Thanks
Frozentech Posted January 4, 2007 Posted January 4, 2007 muuuahhhhhh, what a crosette @ Frozentech.damn good...............looks real prof.you used a crosette-pump?what you used for burst?holy shamoly!I used a 3/4" crossette pump from Rich Wolter for that shell, with KP on rice hulls for burst. I'm working on a 6" can with 1 1/4" crossette comets now, I have to pump a bunch more ( like another 600 grams worth ) of comets before I can go any further, and can't do that till I get back home next week. Should be 'interesting' There's a bunch of construction pics of my 3" crossette shells and a pic of that 4" shell being built at:http://www.pyrotechs.org/content/view/18/44/
Frozentech Posted January 10, 2007 Posted January 10, 2007 Frozentech how deep is the cavity of the 1 1/4" crosette? thx The cavity is 20mm deep. The 'pinhole' at the bottom is an additional 5.5mm deep.The cavity is 11.4mm across at the widest point of the 'X', and 7.8mm across at themost narrow part between the arms of the 'X'. Hope that helps.
Wiktors Posted January 10, 2007 Posted January 10, 2007 Hi Needs the exact, detailed( in the high resolution) pictures of crossette pump or technical drawing.I will be grateful for the help. sorry too offtop
ZoSo357 Posted January 11, 2007 Posted January 11, 2007 What kind of formers do you guys use for making your aerial shells? I use a ping-pong ball which I coat in kraft paper until about a 1 or 2 mm wall thickness is formed, then let it dry and cut around it and slip off the hemispheres for my 1.5 inch mortar, but I want to start making some 3" shells. What kind of formers could you use? I assume if you were to use styrofoam balls or something similar, they'd probably come in sizes of 3 inch exactly (rather than slightly less than), and you would have trouble getting sizes that would allow for the thickness of your kraft paper and possible spiking of the shell to fit in your mortar once done. Surely someone here who makes their own shells knows an answer to this?
50caliber Posted January 11, 2007 Posted January 11, 2007 You could try making 3inch shells like this http://www.xsorbit2.com/users/apcforum/ind...&num=1105170731
cplmac Posted January 11, 2007 Posted January 11, 2007 I think a tennis ball is about right. You could just buy the hemis from skylighter or firefox. Basically for a three inch shell any 2.5" sphere will do. 5" Veline Blue with Ti whistle spolette. Bad symmetry, but worked pretty well.
Mumbles Posted January 11, 2007 Posted January 11, 2007 I do believe billiard balls are about good. Usually I purchase my hemis. When I need an innner hemi, for a double petal for instance I generally just form them over plastic ball shells. If you're worried about there not being enough room for pasting, you could always paste over the inside.
Mumbles Posted January 14, 2007 Posted January 14, 2007 Maybe lampblack is stronger than charcoal, but I have used something similar. 70-30 Perc-charcoal, and it is relatively weak. It is designed for larger shells. 8 to 10" single petals I am talking here. The dichromate would indeed speed it up, and the lampblack may perform a bit better. I can't comment specifically on this mixture, but the one I tried would be disappointing to most. The bursting strength may indeed be stronger, but it may be one of those things where it needs a larger area to get up to optimal preformance. Similar to how KP is stronger than BP, but it needs a high pressure to preform in that fashion. Just burning KP on the ground is disappointing.
ThaYankee Posted January 16, 2007 Posted January 16, 2007 Some nice 2 and 3 inch shells I fired with newyear: http://www.apcforum.net/forums/index.php?showtopic=889 there was a problem with the first movie, but it's solved:) so have fun watching it.
cplmac Posted January 17, 2007 Posted January 17, 2007 Looks like another test for the video file coming up. I will make 5 reports, 10 grams each of BP, KP, H3, Flash, and the Perch/Lamp.
cplmac Posted January 18, 2007 Posted January 18, 2007 As promised, here is the test. Break charge test. 10 gram charge, identical containers. From left to right; BP, KP, KP/lampblack, H3, Flash.
Mumbles Posted January 18, 2007 Posted January 18, 2007 Weird, Flash was the strongest. Whoever would have thunk. The lampblack one sounded a bit sharper than KP, but seemed to have a lot less flame, which may instil problems for blowing stars blind. Chances are with my mix I used the shitty commercial airfloat, which caused the poor preformace. I now use it as a flamable filler in my comet shells and such.
itwasntme Posted January 18, 2007 Posted January 18, 2007 As promised, here is the test. Break charge test. 10 gram charge, identical containers. From left to right; BP, KP, KP/lampblack, H3, Flash. What kind of link is that? All it goes to is "http:///".
Mumbles Posted January 18, 2007 Posted January 18, 2007 He forgot to add the link part of it. I fixed it. He showed it to me earlier.
Karlos Posted January 18, 2007 Posted January 18, 2007 Hallo. I have a guestion for you. Which kind of pressed inserts creating this effect from japaese display shells?http://img02.picoodle.com/img/img02/7/1/17...am_94f99188.png I thing that this effect ic called like bee in the japan. I´m certain of this versions:http://img02.picoodle.com/img/img02/7/1/18...am_79bf93d2.jpg Please help me with this.Sorry my english in not so good. Bye.
cplmac Posted January 18, 2007 Posted January 18, 2007 BP:75/15/10 Nitrate, Charcoal, SulfurKP:75/15/10 Perch, Charcoal, SulfurKPL:70/30 Perch, LampblackH3: 70, 30 Chlorate, CharcoalFlash my flash I thought the weakest to strongest was BP, KPL, KP, H3, Flash. All ingredients are commercial.
ewest Posted January 18, 2007 Posted January 18, 2007 Karlos, I don't know how that effect was done but it certainly is spectacular! I've never seen a shell like that before. The other jpg you has is called a bee in Japan, but we call it a hummer. If you search the web or the forum be sure to search for hummer. And if you were asking if the hummer is what made the effect in the aerial shells I don't think so, but maybe, I'm not sure.
Pretty green flame Posted January 18, 2007 Posted January 18, 2007 I would dare say that that effect could be obtained with a double petal shell. The outer petal would be constructed of hummers and the inner petal with many many small micro stars. Canister shells would probably be better suited for this purpose.
Mumbles Posted January 18, 2007 Posted January 18, 2007 Honestly. it looks like the color is microstars from the tail. If you look closely at the purple one on the lower left edge, you can see it is definatly not a petal of any sort. It has a general star or crown shape to it, which indicates it comes from the Ti tail, not the rest of the shell itself. Those could be one of two things. Either humers, or tourbillions, probably with a Ti tail. If you had a violent burning silver star it could maybe be a matrix comet, but I'm not sure. I have indeed seen some thick flitter stars. The only stars I have ever made that could ever get anywhere near that thick of a tail are all charcoal based. My best guess would be a hummer or tourbillion with a matrix comet on the top, or just very large hummers or tourbillions to allow for larger vent holes to let out the microstars.
FrankRizzo Posted January 18, 2007 Posted January 18, 2007 Those are my favorite type of shell; they're called Farfalle. The inserts are made like "A" in Karlos' picture, but with an extra vent directly opposite the first. Of course Mike S. has explained their construction, so I'll quote him: Farfalle are made using a 3/4" tube, I suppose about 3" long. A solid clay plug is pressed in one end. A hole of maybe 1/8" dia. is drilled straight through the tube just above this clay plug, so that two holes are positioned 180 degrees from each other. A piece of match is then threaded through the holes. Composition is pressed in as many increments as are necessary to fill the tube almost full, and finally another clay plug is pressed to close it. The classic composition would be something like 3 or 4 oz. of steel filings to a pound of duPont Fine Meal. A trouble with such compositions is that even if the steel be treated with linseed, etc., the shelf-life of the farfalle will be limited. You could try titanium or ferro-titanium, but, as Don once told me, the resultant product would not be real farfalle.
Mumbles Posted January 18, 2007 Posted January 18, 2007 That still doesn't explain the microstars in the tail though. Honestly farfalle was one of the first things that came to mind, but I have no idea what they actually look like. I could be mistaken about microstars inside the inserts themselves, but there are several arms from that purple that are quite convincing.
Karlos Posted January 18, 2007 Posted January 18, 2007 Thanks guys.Frankrizzo: I thing that 3" is very much long for shells. You can see two basic types of this effects:Stars with confused flying like this:http://www.srs.ne.jp/~north/special/hanabi/Hanabi1.jpg And stars with linear flying like this:http://www.fireworks.de/assets/images/intro14farfalle.gifhttp://www.vuurwerklook.com/effecten/images/1/image053.jpgThis is video with wanted effect with unknown spinning stars.http://hanabin.gotdns.com:8080/hanabi/mov/2003pl_010.wmv This video is from my favourite site: http://www.mb.ccnw.ne.jp/hana310/index.html If this effect is called farfalls and tubes lookin like the A type from my pictures, which ignition type is better?:http://img02.picoodle.com/img/img02/7/1/18...fam_4c47fe1.jpg I try making any tourbs. with gypsum as the plugs:http://img02.picoodle.com/img/img02/7/1/18...fam_364e035.jpgI used BP with 20Al. It will be supprise for me.Do you thing that this effect is suitable for cylindricall shells? Not for round shells?Sory my english is low.Thanks and bye.
Mumbles Posted January 18, 2007 Posted January 18, 2007 Of your ignition types, A would be better. To get the full effect you need a hole completely through though, as in both sides of the tube. Just one side won't give the same effect. It gives kind of a corkscrew effect. As far as round vs. cylindrical shells, it's up to you. Long inserts like farfalle are better suited to cylidrical shells due to the geometry. Small inserts such as hummers and bees are perfectly acceptable for round shells though. Some of you tourbillions look a lot more like hummers to me. Tourbillions don't have holes in the middle. This kind of stuff all gets confusing though. Let us know how they preform.
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