Trying again using KNSO with our new casting bases. We also have a real
eye-dropper now for measuring the surfactant. 4 38mm grains of
-1.875" length, using formula of
+1.875" length, 250 gram batch using formula of
-* 65% KNO3
-* 35% Sorbitol
-* 1% red iron oxide
-* 3 drops Polystep-B1
+* 65% KNO3, 162.5g
+* 35% Sorbitol, 87.5g
+* 1% red iron oxide, 2.5g, added after melt
+* 3 drops Polystep-B1, added before pour
## Process ##
## Observations ##
-Pour went really smoothly. One grain looked "perfect" with the propellant
+Pour went really smoothly. Easier than previous batches, perhaps due to
+a bit more surfactant, perhaps just getting better, perhaps due to putting
+the mandrels in post-pour. One grain looked "perfect" with the propellant
settled evenly and a couple mm of open gap at the top of the casting
tube. We think this one may have been slightly under-filled compared to
the others, all of which had some evidence of propellant sticking to the