Posted 28 April 2009 - 08:24 PM
I was going to ask for the formula myself arthur,it is a lovely effect.
Give me a mo and I will post details of how I do it. I am sure you are referring to a shell or two you may have recently seen.
Posted 28 April 2009 - 08:29 PM
Potassium Nitrate: 36
Charcoal Airfloat: 29
Charcoal, 80 mesh: 14
Titanium, sponge, 40-80 mesh: 7
It's essentially a slow burning charcoal willow star with added Ti to give a bright brocade effect. To prepare, mill the ingredients, except the 80 mesh charcoal and Ti, together for a few hours and then screen in the remainder. Use a moderately reactive charcoal such as pine.
An 18mm pumped star will burn for 10+ seconds and hang for 30s or so in the sky. A beautiful effect indeed...
Edited by BrightStar, 28 April 2009 - 08:43 PM.
Posted 28 April 2009 - 08:33 PM
Potassium Nitrate 36
Charcoal Airfloat 29 (Pine)
above 3 milled together for 1 hour ish
Charcoal, 40 - 80 mesh 14 (White Pine)
Titanium, sponge, 20 mesh 3.5
Titanium sponge, 40 mesh 3.5
Dextrin or SGRS 5
I find that a coarser grade of Ti gives a better effect with much longer hanging white sparks. The type of charcoal also has a bearing on the effect.
In the shells at the weekend the stars were 22mm pumped, 30mm long. The stars break up in flight to give the effect. 10 seconds sounds a little long for the flight, but the hang time can easily be 30 seconds as you say Brightstar.
Edited by digger, 28 April 2009 - 08:39 PM.
Posted 28 April 2009 - 09:57 PM
This one perhaps?
That is a lovely shell, I believe that belongs to another Forum member. If he wants to own up.
Here is another slow gold from the day, unfortunately less well filmed as it was a little lower on the break.Clicky
Posted 01 July 2009 - 08:17 PM
I just wonder if ball milling is necessary to achieve the long hang effect and the dense tail; or could you just use airfloat charcoal?
Another possibility could be wet processing (precipitation) - Shimizu rates wet methods very high for charcoal and willow effects.
Edited by AdmiralDonSnider, 01 July 2009 - 08:17 PM.
Posted 01 July 2009 - 11:28 PM
Posted 02 July 2009 - 10:06 AM
I'm sure my charcoal contributed though, my pine is fairly fast.
Posted 06 July 2009 - 12:22 PM
Posted 06 July 2009 - 04:38 PM
Any adverse effects on the performance of these stars when they are cut? I don't want to scratch my tooling to death when making these as I hear titanium is pretty rough on tooling.
It sure is. Although it depends on the type of Ti. I find that sponge is not to bad with stainless steel or bronze tooling. However turnings destroy everything.
Posted 06 July 2009 - 08:42 PM
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Posted 09 July 2009 - 08:44 PM
Pump stars then discard the pump when too worn.
Keep mannequins and watermelons away from fireworks..they always get hurt..
Posted 13 March 2010 - 06:50 PM
The comp isn´t expected to work well pumped and cut either...
Edited by AdmiralDonSnider, 13 March 2010 - 06:51 PM.
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