In my meanderings around the web, I came across the following formula for a "Gerb, Blue":
Ammonium perchlorate 38%
Copper (II) oxide 16%
Aluminium flake, 100-325 mesh 10%
Charcoal, airfloat 3%
On paper, this looks to me like it would be a very nice effect, however, I have very little experience of working with ammonium perchlorate, just a few coloured flare type compositions.
The formulation came with no information about mixing or charging to a tube, however, I think that the mixing should be quite straightforward, pretty much the same as anything else really with a few extra safety precautions.
My main concern is the best way of charging it to a tube. I've read that perchlorate compositions and, indeed, any composition containing metals should never be rammed with a mallet and drift so that seems to be out especially with the "enthusiasm" of amm. perchlorate. Lightly tamping by hand pressure with a wooden drift would seem possible but always runs the risk of leaving a void in the packed tube with unpleasant consequences. So, that leaves pressing the composition which I can do if necessary. Is this the best or safest way to proceed?
So, does anybody have an opinion on the best way to fill a tube with such a composition? has anyone made something like this and would share their views on the best band safest way of charging a tube?
I was also very interested to come across this formulation as, at the back of my mind, I've been thinking about amm. perchlorate compositions as drivers for wheels etc. The fact that a stoichiometric mixture with something li8ke red gum would give all gaseous products would seem to me to make it a good candidate for such an application. However, it may be a bit too energetic unless you want a very fast wheel!
Has anyone tried such a composition as a driver?