capture skeletal data from latest tests

[web/gag.com] / rockets / research / 2019-test-5.mdwn

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+# Test 2019-5 #
+
+This was my second flight with "Everclear". 
+
+5 grain 54mm Everclear motor with #36 nozzle, using one 45-cal pyrodex
+pellet on an e-match for ignition.  Flown at Tripolo Colorado Spring Fling
+2019 on Sunday morning.
+
+The grains used were from the 21 May 2019 batch:
+
+* 21 May grain 6
+* 21 May grain 3
+* 21 May grain 16
+* 21 May grain 8
+* 21 May grain 2
+
+Used abou 16.75" of ARR liner.  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 ##
+
+PFND.
+
+Tiny bit of liner burn-through at the junction between grains 6 and 3 (one
+grain forward of the nozzle).  The buna-n o-rings were pretty cooked on the 
+nozzle end, but no evidence of blow-by.
+
+Forgot to get pre-flight masses.  The post-flight mass of the airframe and 
+motor was 4140g.  That's complete except for maybe 3-5g in the ejection 
+charges, and of course the propellant consumed.
+
+Flight data in 2019-05-26-serial-1257-flight-0018.eeprom shows 9170 ft GPS
+apogee.