capture data on 21 May propellant batch

diff --git a/rockets/research/2019.01.07.mdwn b/rockets/research/2019.01.07.mdwn
index dae4d228782757655d340891803d34ded6e498b1..7152a3d9fb794254c764aca21e94ade75b2ffe17 100755 (executable)
--- a/rockets/research/2019.01.07.mdwn
+++ b/rockets/research/2019.01.07.mdwn
@@ -1,6 +1,6 @@
 # Batch 2019.01.07 #
 
-4 Terry-length Everyclear grains for 54mm cases, with 0.625 inch cores, 
+4 Terry-length Everclear grains for 54mm cases, with 0.625 inch cores, 
 cast as two 6-inch-long double grains with 0.5" delrin coring rods, then 
 cut, cored, and trimmed as necessary.
 

diff --git a/rockets/research/2019.01.08.mdwn b/rockets/research/2019.01.08.mdwn
index 0112b4beb154a4cf48a975cf70ec18a881cbc5e9..569fa8b16f5d099709dc6e09f2a153e555bc6211 100755 (executable)
--- a/rockets/research/2019.01.08.mdwn
+++ b/rockets/research/2019.01.08.mdwn
@@ -1,34 +1,25 @@
-# Batch 2019.01.08 #
+# Batch 2019.05.21 #
 
-4 Terry-length Everyclear grains for 54mm cases, with 0.625 inch cores, 
-cast as two 6-inch-long double grains with 0.5" delrin coring rods, then 
+8 Terry-length Everclear grains for 54mm cases, with 0.625 inch cores, 
+cast as four 6-inch-long double grains with 0.5" delrin coring rods, then 
 cut, cored, and trimmed.
 
 The 54mm casting tube I'm using weighs 1.84g per inch.
 
-This was my second time mixing APCP propellant.  Again used the 4.5qt mixer 
-and hand packed with no vacuum processing.  Same formula as yesterday
+Third time mixing APCP propellant.  Again used the 4.5qt mixer and hand 
+packed with no vacuum processing.  Same formula as previous batches.
 
-These grains were cast on 2019-01-08.
+These grains were cast on 2019-05-21.
 
 ## Results ##
 
-The updated batch size was just right, there was a bit of excess propellant
-so we can make density and burn rate measurements after cure.  The excess
-weighed in at 17.9g after cure.
 
-* Grain 1, 2.980" long, 162.6g gross, 5.48g casting tube, 157.12g net
-* Grain 2, 2.970" long, 162.0g gross, 5.46g casting tube, 156.54g net
-* Grain 3, 3.010" long, 164.7g gross, 5.54g casting tube, 159.16g net
-* Grain 4, 2.995" long, 163.6g gross, 5.51g casting tube, 158.09g net
-
-The mass per unit length was within 0.1g/inch, which seems awesome.
-
-In total for this batch and the previous day's, which were post-processed 
-together at the same time, there was 10.4g sanded off the grain ends and
-64.7g of waste from core drilling the 0.5"-ish holes to 0.625".  Really
-leaves me wondering if it wouldn't be better to just start with the right
-size coring rod for future batches and avoid the coring waste.  Might leave
-me wanting to rough the cores for better ignition?  But, maybe not.  Something
-to ponder more.
+* 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
 

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.
+

diff --git a/rockets/research/index.mdwn b/rockets/research/index.mdwn
index 1cf9f980ceef6caf14e265e769256cee95868521..c3ddb9b2289b59e1969eb9a4b7fff3fb02d38862 100755 (executable)
--- a/rockets/research/index.mdwn
+++ b/rockets/research/index.mdwn
@@ -14,6 +14,7 @@
 * [2019 batch 01](2019.01.07.html) - 7 January 2018 - 4 54mm Everclear APCP grains
 * [2019 batch 02](2019.01.08.html) - 8 January 2018 - 4 54mm Everclear APCP grains
 * [2019 test 01](2019-test-1.html) - 28 April 2018 - 2-grain 54mm Everclear on test stand
+* [2019 batch 03](2019.05.21.html) - 21 May 2018 - 16 54mm Everclear APCP grains
 
 ### 2018 ###