new knsb batches

[web/gag.com] / rockets / research / 2018-batch-03.mdwn

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+# Batch 2018-batch-02 #
+
+4 grains 80mm long for 54mm cases, with 0.5 inch cores
+
+These grains were cast as a demo for college students on Monday. 
+
+The simulator says we need 200g of fuel per grain, so the batch size will
+be 800g (plus a bit for the pan made up by re-melting previous scraps):
+
+* 65% KNO3, 520g
+* 35% Sorbitol, 280g
+* 1% red iron oxide, 8g, added after melt
+* 12 drops Polystep-B1, added before pour using eye dropper
+
+This formula is completely fluid with 225F indicated on the Presto Multicooker,
+but viscosity is noticeabley lower making for easier pouring at 250-275F.
+
+Grain fill lines 73.6mm from the bottom of the casting tube.
+
+These grains were cast on 2018-12-17.
+
+## Results ##
+
+* Grain 1, g gross, 5.78g casting tube, g net propellant
+* Grain 2, g gross, 5.82g casting tube, g net propellant
+* Grain 3, g gross, 5.78g casting tube, g net propellant
+* Grain 4, g gross, 5.80g casting tube, g net propellant
+