capture data on 21 May propellant batch

[web/gag.com] / rockets / research / 2019.01.08.mdwn

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