document first research propellant work in 2017

[web/gag.com] / rockets / research / 2017-batch-01.mdwn

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+# Batch 2017-batch-01 #
+
+16 grains of 54mm using sorbitol, intended to be 4 reloads for the longest 
+54mm snap-ring case currently in our possession, and/or some mix of lesser
+loads.  Grain length 76mm with 2mm spacing per grain, so we'll make the 
+casting tubes 78mm long.  Delrin coring rods of 0.5" diameter.  
+
+We'll mix and pour 4 grains at a time to make the material handling easier
+with our available triple-beam balance.  Formula for a batch size of 875g:
+
+* 65% KNO3, 568.75g, taken from the big bucket this time
+* 35% Sorbitol, 306.25g
+* 1% red iron oxide, 8.75g, 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.
+
+These grains were cast on 15-17 May 2017.
+
+Liner should be cut to 13.25" long for a 4-grain reload.
+
+## Results ##
+
+* Grain 1, ?g gross, ?g net
+* Grain 2, ?g gross, ?g net
+* Grain 3, ?g gross, ?g net
+* Grain 4, ?g gross, ?g net
+
+* Grain 5, ?g gross, ?g net
+* Grain 6, ?g gross, ?g net
+* Grain 7, ?g gross, ?g net
+* Grain 8, ?g gross, ?g net
+
+* Grain 9, ?g gross, ?g net
+* Grain 10, ?g gross, ?g net
+* Grain 11, ?g gross, ?g net
+* Grain 12, ?g gross, ?g net
+
+* Grain 13, ?g gross, ?g net
+* Grain 14, ?g gross, ?g net
+* Grain 15, ?g gross, ?g net
+* Grain 16, ?g gross, ?g net
+
+With a 13.250" liner, 8.9mm nozzle throat, buna-n o-rings, simulation says
+this makes a 39% J-597, 1050 Ns, with about a 1.5 sec burn
+
+## Observations ##
+