In an attempt to make my nozzles grip the case, I tried just caramelized sugar. I melt and cast my motors. Usually I separate the grain (usually single grain cast in the case) with tape while I pack the nozzle. This time, I separated it with tape (electrical, which I thought might melt under sugar, it didnt) and pored pure sucrose over the end of the motor tube and put a smaller coring tool in there to make a nozzle (and figured with it a bit while it was cooling to make a bit of an expansion section, you may be able to see in the pictures). After it cooled, I broke it loose and pulled it out, I cracked 3 (maybe a forth) places. I thought the cracks might compromise the motor and when pressure it out on the nozzles it will shatter and fall out. I tried testing anyways because the worst that could happen is the nozzle does shatter and blow out.
It worked perfectly and, unfortunately, I was unable to recover the motor (as I just shot it straight up because I do not have a test stand). So I am not able to look at the erosion of the nozzle (expected to be high at first, but after seeing the motor, might be much lower than expected).
Planning on doing a face down test to look at the nozzle after (and maybe through) the burn. Will report what I can about the erosion, but this may not be much as it might melt AFTER it fires.
The motor burn for about 1-2 seconds, it was a 2 inch deep core, 5/16 inch diameter core, 3/4 inch case, 1/8 inch throat diameter.
EDIT: not letting me attach pictures on mobile, will try up update later.
Edited by JMan, 14 May 2020 - 10:57 AM.