On Jun 29, 12:41=A0pm, Bob <robg...@[EMAIL PROTECTED]
> wrote:
> Is H3 burst (KClO3-charcoal) always loaded in a burst bag? =A0Or is it
> ever mixed loose with stars that've been primed with meal? =A0Or is it
> used loose with stars that have no sulfur-containing priming?
>
> I ask because even though chlorate stars can be primed with meal, it
> would seem the friction problem would be greater with loose chlorate
> powder in contact with such primes.
>
> Is the ability of H3 burst to ignite stars such that priming them can
> be omitted?
>
> Robert
I don't know how much H-3 burst powder is used outside of Japan, due
to the economics of im****ting high quality Japanese shells into the
USA as well as the restrictions placed upon those im****ts. Nearly all
of the Japanese shells I've seen over the years DID use a tissue bag
seperator between the H-3 coated chaff or seeds and the stars but I
don't hink this was primarily a safety technique. I think it has more
to do with the ease of loading a warimono shell using a bag, but more
im****tantly, the better compacting of the stars to keep them from
****fting and spoiling the pattern. The tissue allows for a tighter
hold on the layerered peripheral stars than tightly cramming loose
coated hulls. Very small shells (2-1/4" -2-3/4") that were brought in
from Japan in the 1960s had no tissue liner and were of course,
unlifted to be loaded into American class C tube items.
My guess is that the H-3 burst charge is only used on the best smaller
Japanese shells (under 6") and even then, only by the masters. The
larger warimono shells can be made with the weaker KP or BP break
charges with a heavier pastewrap.
****mizu covers the force of explosion in H-3, KP and BP coated nuclei
and the force of explosion of H3 is extremely high. I believe that
the temperature of explosion is comparable to the slower KP/dichromate
burst charge.
All stars are primed with a finish of std. black powder whatever burst
is used. In practice, the sulfur bearing prme top coat in direct
contact with an H3 burst charge doesn't seem to be a problem.
John
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