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.
 
 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 ##
 
 
 ## 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