From bb5c48ccb9640a5a2b9f2fe4db0944775c53a6b6 Mon Sep 17 00:00:00 2001
From: Bdale Garbee <bdale@gag.com>
Date: Mon, 2 Jul 2018 11:26:58 -0600
Subject: [PATCH] preparing to cast my first propellant of 2018

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+# Batch 2018-batch-01 #
+
+A slightly improved "repeat performance" M reload for my CTI Pro75 6xl case 
+with Loki nozzle and forward closure.  
+
+Using Terry's #50 "short" Loki nozzle, we need a 38" liner and have just
+under 37" available for fuel.  Using dash-143 buna-n o-rings as grain 
+spacers, let's try 7 grains of 5.205" length, or 132mm, using Delrin coring 
+rods of 0.75" diameter.  This will be slightly more progressive than the
+8-brain config last fall, but all parameters look good and it's a tad more
+propellant due to one less inter-grain gap.
+
+The simulator says this could be a 34% M-2593.
+
+Based on previous experience, there will be enough shrinkage to necessitate 
+a "topping up" of each grain after the initial pour cools.
+
+The simulator says we need 4919g of fuel for these grains, so let's melt a
+batch size of 5kg:
+
+* 65% KNO3, 3250g
+* 35% Sorbitol, 1750g
+* 1% red iron oxide, 50g, added after melt
+* 75 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 <date>.
+
+## Results ##
+
+Average casting tube weight <mumble>g.
+
+* 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
+
+Total propellant load <mumble>g.  
+
+Revised simulation says this will be...
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2.30.2