24 replies to this topic

[KarlosH]

Hallo. Colored hummer are iteresting pyro effect for me more and more. I hawen´t special literature, tutorarial, experiences.
Newerheless colored hummer, bees and serpents aren´t non-event. However obtain iformations from firework factories and forums is hard. Why?
I hawe a question about their funktion. I can make easy hummer with BP or BP enriched Al, no problem. But Brilliant stars and their placing, location is a riddle for me. Sorry, this is maybe obvious for anyone..but for me.... not!
Star-press-composition in the hummer tube-body is maybe good, maybe bad idea because light of burning composition will be partly hidden behind the tube margins. Maybe not. But pressed stars will be worse drying in the tube! Then clay plugs are unnecessary, or not?
Another idea require two tapped sars which are fixed on both of end.
What is better?
I need know-how, before tests, I want fire them in poka 70mm shells(cca 6 - 7 hummers in one shell). Composition is not problem, I will use any brilliant red, but what next? I don´t want walk along blind alley!
Do you know contacts for any specialists?
Where are specialists? Nobody don´t want send reply to me from Japan-factories:-)
Sorry, sorry for my english, I know it is poor, stupid.
Bye.

Karlos.

[pyrotrev]

Don't worry about the coloured comp being hidden in the tube, if you use a fairly fierce burning mix (magnalium based would be good I guess), the flame will easily extend outside during the whole of it's burning. As for the drying, it will likely take a little longer, but since both clay and cardboard (tube) are somewhat permeable to water it shouldn't be too big a problem. Glueing a finished star in the end would also be an option and a bit quicker too, it should be quite secure if there's a little recess in the end of the tube for it to sit in. I'm not surprised that you've not had replies from factories - they have to work hard to perfect a saleable product, and then need to be able to make some money out of it in order to survive: if they published stuff on the net, there are plenty of cheapskate companies around the world who would copy it and pinch their market. Don't be concerned about your English - it isn't so bad either - we can understand you!

Edited by pyrotrev, 26 February 2008 - 01:23 PM.

[KarlosH]

Pyrotrev: Thanks, thanks. It´s a really true, what you wrote about replies from factories, but none reply??????
Example: Sorry, but we don´t give this information to you.....(accept)
They aren´t able to write only one word, only one letter. Nothing. Anybody mus speak in english, must, in their factory. Vrrrr, hhrrrrr >:-(
I nedd only basic information. Their products are like from the copy(printer), asiats(japanese, chinese) often copying.
Informations like a Lenght and ID of the tube are problem? Kind of binder...??? I don´t want their compositions! Their know how. ?????
Bye.
Karel from Czech republic. (sad pyroman)

[GalFisk]

My guess is that they are completely uninterested in us hobbyists, and any email that isn't a big order or something else to do with business is just thrown in the spam box. You'll have better luck getting info from us hobbyists, I'm sure many have built what you're attempting (I haven't..yet) and are willing to answer your questions.
Also if you don't have it yet, I recommend that you get a subscription at Passfire.com, the site has lots of information and how-to's of the very highest quality.

[portfire]

KarlosH-Which type of coloured hummer are you interested in,one's where the propellant provides both thrust+colour,or the one i've been working on ?.I can give you the dimensions of mine if you want.

Dean

[KarlosH]

Galfisk: Yes, hm.....maybe anybody will be want to write anytime... couple of words. In the Japanese, working a much of young people in fireworks, maybe anybody of them use internet, ICQ, Jabbin.....:-)

Portfire: Hummers with two stars, glued or pressed in.....(10 - 12 mm ID, 2 - 24 lenght, for pressed stars in hummer, longer tube)???
This effect: http://n-joy.cz/vide...cF6CeScuICb9RA/ from hanabi.co.jp
http://www.hanabi.co...ta.benihati.htm

Bey and Thanks

[portfire]

Galfisk: Yes, hm.....maybe anybody will be want to write anytime... couple of words. In the Japanese, working a much of young people in fireworks, maybe anybody of them use internet, ICQ, Jabbin.....:-)

Portfire: Hummers with two stars, glued or pressed in.....(10 - 12 mm ID, 2 - 24 lenght, for pressed stars in hummer, longer tube)???
This effect: http://n-joy.cz/vide...cF6CeScuICb9RA/ from hanabi.co.jp
http://www.hanabi.co...ta.benihati.htm

Bey and Thanks

Hi KarlosH.I haven't started experimenting with those ones yet, but after watching that video a couple of times i came up with a idea as to how they might be made.

Watching the video you can see that the stars hang slightly before jeting off.This got me thinking that they could be small rocket like devices, but with a twist.



A star comp is pressed into a tube, but with a core formed.You'll see from the picture that there is space left in the tube for more comp to be pressed in,although i think it would best to load the last part in as if you were pumping stars.This would avoid damaging the core.

The idea is that solid star comp will allow the device "hang" and then you've effectively got a nozzless core-burning rocket.

Dean

[KarlosH]

Hi portfire. I hope, that you will give the videos of youre tests here:-)
I lowe two type of inserts. Colored hummers, and japanese called: bee and bees, firing from poka shell. Colored bees hawe really stright movement, wuthout spiral flying, only axial totation. I thing that they must have hole on side and bees, which flying spirally look like small rockets, unstabilised. But i need the best optimal size of hummers and bees. I don´t want make a many tests, and finis with poor product...:-( The poka shells contain usually 8 - 10 colored hummers, which must be lenght (with stars) cca 4 - 5 cm. Not more.
See this picture:
http://www.kokusaien...03-starmine.jpg
http://www.kokusaien...-starmine_2.jpg
http://www.japan-fir...basics/poka.gif
I will try to make this type wit stars on ends of classic hummers with ID=10mm.
Maybe....

Bye.

[KarlosH]

hallo. I just know, that bee and bees is name for two type of effect.
First is maybe OK, and belongs to paper tubes with one hole in the plug(nozzle). Usually is filled with BP and Aluminum or titanium powder. (5 - 20%).
Their mowing is spiral.
Second effect called bees are small hummers with star composition contain Magnesium or magnalium, in the tube(main composition), not on ends. Hole is on the side and their mowing is straight with high speed rotation and humming sound. This product lightitng enough, because hawe high speed rotation, and human eyes can´t observe this.
Both effect are used in poka shells, with small quantity of granulated black powder.

http://img37.picoodl...cim_13812d5.png

Go getters are still question for me. Mainly optimal size for tube. Long tubes like 1 1/2 inch are not suitable, not for small shells, because most of go getters from japanese videos burn shortly.
??????
bye.

Nice video: http://vinz.jp/video...76_71_5_1ch.wmv

Edited by KarlosH, 26 August 2008 - 09:36 AM.

[pyrotrev]

Watching the video you can see that the stars hang slightly before jeting off.This got me thinking that they could be small rocket like devices, but with a twist.

Both hummers and Go-Getters tend to do this, as there's a bit of a delay until a decent amount of composition inside the casing gets burning to develop enough thrust.