record grain measurements from 16-grain Everyclear 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
index cbe221f7ab7f1c93dc2b2dff51ec04452e270fae..2d5de9aa96437cf256418b1ea4f93178abd2508a 100755 (executable)
--- a/rockets/research/2019.05.21.mdwn
+++ b/rockets/research/2019.05.21.mdwn
@@ -22,23 +22,27 @@ 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
+Grains were cut, core drilled to 0.625", and sanded more or less ala Terry's
+process.  In the data below, lengths are a bit approximate due to imperfectly
+squared ends, gross masses are precise using my new 600g by 0.01g scale!
+
+* Grain 1, 3.015" long, 163.98g gross, g casting tube, g net
+* Grain 2, 3.005" long, 161.27g gross, g casting tube, g net
+* Grain 3, 3.020" long, 163.80g gross, g casting tube, g net
+* Grain 4, 3.045" long, 164.84g gross, g casting tube, g net
+* Grain 5, 3.058" long, 166.03g gross, g casting tube, g net
+* Grain 6, 3.010" long, 164.85g gross, g casting tube, g net
+* Grain 7, 3.040" long, 164.70g gross, g casting tube, g net
+* Grain 8, 3.010" long, 162.85g gross, g casting tube, g net
+
+* Grain 9, 3.011" long, 164.15g gross, g casting tube, g net
+* Grain 10, 3.008" long, 164.44g gross, g casting tube, g net
+* Grain 11, 3.020" long, 165.51g gross, g casting tube, g net
+* Grain 12, 3.015" long, 164.38g gross, g casting tube, g net
+* Grain 13, 3.030" long, 166.97g gross, g casting tube, g net
+* Grain 14, 3.012" long, 162.41g gross, g casting tube, g net
+* Grain 15, 2.963" long, 160.36g gross, g casting tube, g net
+* Grain 16, 2.957" long, 158.61g gross, g casting tube, g net
 
 The mass per unit length was within ?g/inch.