capture data on 21 May propellant batch

[web/gag.com] / rockets / research / 2019.05.21.mdwn

diff --git a/rockets/research/2019.05.21.mdwn b/rockets/research/2019.05.21.mdwn
new file mode 100755 (executable)
index 0000000..cbe221f
--- /dev/null
+++ b/rockets/research/2019.05.21.mdwn
@@ -0,0 +1,44 @@
+# Batch 2019.05.21 #
+
+A total of 16 Terry-length Everclear grains for 54mm cases, with 0.625 inch 
+cores, cast as 2 batches of 4 6-inch-long double grains with 0.5" delrin 
+coring rods, then cut, cored, and trimmed.  Grains 1..8 cast by Bdale, grains
+9..16 cast by Jamie and Luke with Terry observing.
+
+The 54mm casting tube I'm using weighs 1.84g per inch.
+
+Third time mixing APCP propellant.  Bdale again used the 4.5qt mixer, Jamie
+and Luke used Terry's mixer, all hand packed with no vacuum processing.  Same 
+formula as previously, but with quantities doubled.
+
+Most materials measured with Bdale's new 600g by 0.01g scale, R45 measured
+straight into mixing bowls using Terry's larger scale that goes by 1g.
+
+These grains were cast on 2019-05-21.
+
+## Results ##
+
+The batch size was pretty good, there was a bit of excess propellant in each
+batch so we can make density and burn rate measurements after cure.  The excess
+weighed in at g after cure.
+
+* Grain 1, " long, g gross, g casting tube, g net
+* Grain 2, " long, g gross, g casting tube, g net
+* Grain 3, " long, g gross, g casting tube, g net
+* Grain 4, " long, g gross, g casting tube, g net
+* Grain 5, " long, g gross, g casting tube, g net
+* Grain 6, " long, g gross, g casting tube, g net
+* Grain 7, " long, g gross, g casting tube, g net
+* Grain 8, " long, g gross, g casting tube, g net
+
+* Grain 9, " long, g gross, g casting tube, g net
+* Grain 10, " long, g gross, g casting tube, g net
+* Grain 11, " long, g gross, g casting tube, g net
+* Grain 12, " long, g gross, g casting tube, g net
+* Grain 13, " long, g gross, g casting tube, g net
+* Grain 14, " long, g gross, g casting tube, g net
+* Grain 15, " long, g gross, g casting tube, g net
+* Grain 16, " long, g gross, g casting tube, g net
+
+The mass per unit length was within ?g/inch.
+