initial data on test 11 added

[web/gag.com] / rockets / research / test11.mdwn

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+# Test 11 #
+
+Our first attempt at making 54mm grains with sorbitol.  Grain length 3.25", 
+core diameter 0.5" (only mandrels on hand).  Casting tubes from 
+[ARR](http://www.alwaysreadyrocketry.com/), machined a new set of hardwood
+casting stands on our CNC router, drilled PVC pipe caps for upper mandrel
+centering.
+
+The formula used is the same we've been using with sorbitol, but in an 875g
+batch this time:
+
+* 65% KNO3, 568.75g
+* 35% Sorbitol, 306.25g
+* 1% red iron oxide, 8.75g, added after melt
+* 10 drops Polystep-B1, added before pour using eye dropper
+
+Robert noted that tamping down the material in the grains required a tweak
+to his process for 38mm, since the larger casting tubes and greater propellant
+mass meant having to hold everything together more solidly.  We also noted
+that there was some variation (a mm or so?) in my casting tube lengths, so
+getting them uniformly filled was a bit fiddly.
+
+These grains were cast on 1 September 2015.
+
+## Results ##
+
+* Grain 1, ?g net
+* Grain 2, ?g net
+* Grain 3, ?g net
+* Grain 4, ?g net
+
+## Observations ##
+