Not necessarily. I use AN just as much as I use AP and I find both of
them easy to work with. Usually, the uncured ANCP has the consistancy
of play-doh, whereas uncured APCP is more like cookie dough or peanut
butter. Both propellants can perform just as well as each other in a
motor, all you need to do is tinker with a few simple parameters to
get the kind of burn profile you want. Hence the name "experimental."
I have no experience with the other oxidizers, so I can't speak on
Reading back, I missed the bit in the prior message that this was
specifically in reference to composite solids - "And I don't mean
hybrid or liquid." (I was specifically thinking of liquid ones.)
I suspect procedures and characteristics for most of the
useful nitrate and perchlorate salts are probably fairly
similar in general. (I can't really say much about them -
my amateur involvement has been with H2O2 rather than "hand-made"
Vacuum process and tamp like hell. A vibrating table does wonders. Of course,
it is easier to do low solids that are pourable. I've done up to 88% solids.
PITA. Pre-wetting the casting tube with resin is almost a must.
I found that vacuum processing is really unnecessary with the typical
ANCP propellants. Since it is so thick, all you need to do is roll it
into little blobs with a gloved hand, then pack it into the casting
tube a little bit at a time with a dowel. It is HTPB-based, so it
bonds to the casting tube fairly well.
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