Re: small black smoke/sound units

On Oct 18, 6:35 am, TONY S <kclo42...@xxxxxxxxx> wrote:
On Oct 17, 10:15 am, John Reilly <strb...@xxxxxxxxxxxxx> wrote:





I wonder if anyone has some ideas for a formulation for small black
smoke/report units? I've posted a short clip of a daylight shell fired
at the Katakai Festival in Nigata Prefecture, Japan:http://pyrobin.com/files/hiru3.wmv

The clip isn't very good but instead of using a ball shell with rai
type small report/smoke components, I intend to start with siatenes in
a cylinder shell.
I was thinking in terms of a perchlorate (or chlorate)/naphthalene/
very fine flake magnesium/antimony.  I guess the naphthalene content
would have to be fairly high to provide the smoke (at the expense of
the report intensity) but by using fine magnesium and perchlorate or
chlorate and possibly, a shot of antimony if necessary, the sound
might be adequate in a 10 or 12 gram siatene.
Perhaps something like:

Potassium Perchlorate 55%
Naphthalene       25
Fine flake Mg     20

Any thoughts would be appreciated.

John Reilly

why not use a bag of black chalk or printer toner and a flash
break,that toner stuff is like the finest pigments I've seen ,should
make great clouds of smoke .lampblack is just as messy but probably
more expensive,I would think,- Hide quoted text -

- Show quoted text -

Hi Tony. I have used finely powdered pigments with a flash bag burst
for 5" ball shells and they work OK. I was looking for a scatterered
"artillery" or "flak" effect using small reports which couldn't
scatter enough dye to do the job. A standard aluminum flash charge
also generates competing white smoke in the dust cloud. I don't know
if the naphthalene in the perecentage necessary to produce black smoke
would render a magnesium/perchlorate flash powder too weak to give a
good report in a siattene sized case.

John
.