capturing at least the skeleton of research motor test burn data this month

[web/gag.com] / rockets / research / 2017-test-12.mdwn

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+# Test 2017-12 #
+
+5 grain 75mm sorbitol motor with pyrodex pellet ignition in 4-inch Wildman
+rebuilt airframe at NCR North.
+
+Trimmed CTI 5-grain case (25.75" overall), Loki #42 nozzle, CTI aft closure
+ring, forward bulkhead from Terry's pile machined to have 0.5" inside snap 
+ring plus 0.25" inside liner, with two o-rings, one pushing against liner.  
+
+Liner 23.125" long with about 22.25" available for fuel load.
+
+Had to trim grains to fit.  Four just required squaring up the ends and 
+trimming excess casting tube away.  Fifth one was cut in miter box with saw.
+
+O-rings made forward closure a *very* snug fit.
+
+</p>
+
+Neglected to re-weigh grains after trimming and before epoxying into the 
+liner.
+
+* Grain , g gross, g net, 4.5" long
+* Grain , g gross, g net, 4.5" long
+* Grain , g gross, g net, 4.5" long
+* Grain , g gross, g net, 4.4375" long
+* Grain , g gross, g net, 4" long
+
+Total of g propellant, vs g simulated.
+
+## Results ##
+
+Flight data logged as ? sn ?, flight ?.