capture skeletal data from latest tests

[web/gag.com] / rockets / research / 2019-test-4.mdwn

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+# Test 2019-4 #
+
+This was a 3-grain 54mm Everclear motor using a #24 nozzle.  Ignition was 
+with one of Terry's igniters, on Saturday at the Tripoli Colorado Spring 
+Fling event near Hartsel.
+
+The grains used were from the 21 May 2019 batch:
+
+* 21 May grain 5
+* 21 May grain 14 
+* 21 May grain 7
+
+Small profile o-rings were used between grains, leaving the grains still 
+slightly "loose" in the case.  The buna-n o-rings on the nozzle and forward
+closure were lightly greased, and the liner exterior was heavily greased.
+
+## Results ##
+
+Test stand data in 2019-05-25-serial-3634-flight-0030-4.eeprom.
+
+There was a fairly significant liner burn-through in the middle of the first
+grain near the nozzle, burned-looking area was dime-sized, with maybe 1/4"
+"hole" in the middle.  Some extra ash on case there, but no obvious signs of
+weakening of the case.  Not sure what that was caused by?