test results from Hartsel launch

[web/gag.com] / rockets / research / 2017-test-04.mdwn

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+# Test 2017-04 #
+
+4 grain 54mm sorbitol motor flown in Robert's "High Voltage" airframe at
+a Tripoli Colorado launch in Hartsel on 21 May 2017.
+
+With a 13.250" liner, 8.9mm nozzle throat, buna-n o-rings, simulation says
+this is a 39% J-597, 1050 Ns, with about a 1.5 sec burn
+
+* Grain 2017-01-05, 187.9g gross, ?g net
+* Grain 2017-01-06, 188.3g gross, ?g net
+* Grain 2017-01-02, 187.8g gross, ?g net
+* Grain 2017-01-09, 191.0g gross, ?g net
+
+## Results ##
+
+On site, we recorded this as a perfect flight with no damage.  However, once
+home, when we tried to pull the motor out of the airframe, it wouldn't come
+out.  Turns out we had a near-CATO.  The forward closure pushed the forward
+snap ring about 25% out of the groove, mushrooming the front of the case in
+the process.  We discarded the forward snap ring and will need to trim and
+re-groove the case, but the nozzle and forward closure seem fine.
+
+Flight data logged as TeleMetrum sn 2163, flight 7.