update index too

[web/gag.com] / rockets / research / 2017-batch-04.mdwn

diff --git a/rockets/research/2017-batch-04.mdwn b/rockets/research/2017-batch-04.mdwn
index a0e376fb91815c21e68d5fcb26c8b15319df6c88..ed976cb03dc49d16ceac8b35ff51871daf0b6d01 100755 (executable)
--- a/rockets/research/2017-batch-04.mdwn
+++ b/rockets/research/2017-batch-04.mdwn
@@ -1,16 +1,25 @@
 # Batch 2017-batch-04 #
 
-4 grains of 29mm using sorbitol, intended to be a reloads for the 
-second-longest GMA 29mm snap-ring case.  Grain length 45mm with 1mm spacing 
-per grain, so we'll make the casting tubes 46mm long.  Delrin coring rods of 
-5/16" diameter.  
+4 grains of 29mm intended to be a reloads for the second-longest GMA 29mm 
+snap-ring case, *and* 6 grains of 54mm intended to be 2 3-grain reloads, all
+in one sorbitol melt.  
 
-Formula for a batch size of 135g:
+29mm grain length 45mm with 1mm spacing per grain, so we'll make the casting 
+tubes 46mm long.  Delrin coring rods of 5/16" diameter.  
 
-* 65% KNO3, 87.75g, taken from the big bucket
-* 35% Sorbitol, 47.25g
-* 1% RIO, 1.35g
-* PolyStep B1, 2 drops
+54mm grain length 76mm with 2mm spacing per grain, so we'll make the casting
+tubes 78mm long.  Delrin coring rods of 1/2" diameter.
+
+Formula for a batch size of 1kg:
+
+* 65% KNO3, 650g, taken from the big bucket
+* 35% Sorbitol, 350g
+* 1% RIO, 10.0g
+* PolyStep B1, 15 drops
+
+With left-overs from batch-01, this was enough for all but two of the 29mm
+grains.  We added enough materials for another 100g and were able to finish
+up with a bit left over.
 
 Presto Multicooker operated at 275F indicated.
 
@@ -26,15 +35,26 @@ Simulation says:
 
 ## Results ##
 
-Average casting tube mass 1.25g.
+Average 29mm casting tube mass 1.25g.
 
-* Grain 1, ?g gross, ?g net
-* Grain 2, ?g gross, ?g net
-* Grain 3, ?g gross, ?g net
-* Grain 4, ?g gross, ?g net
+29mm grains
 
-Total of ?g propellant, vs 122g simulated.
+* Grain 1, 29.3g gross, 28.05g net
+* Grain 2, 29.1g gross, 27.85g net
+* Grain 3, 28.9g gross, 27.65g net
+* Grain 4, 28.5g gross, 27.25g net
+
+Total of 110.8g propellant, vs 122g simulated.
 
 With a 7.40" liner, 14/64" nozzle throat, buna-n o-rings, simulation says
 this reload will be a 99% G-180, 159 Ns, with about an 0.8 sec burn.
 
+54mm grains
+
+* Grain 5, 184.6g gross, ?g net
+* Grain 6, 183.3g gross, ?g net
+* Grain 7, 186.2g gross, ?g net
+* Grain 8, 182.6g gross, ?g net (canted - casting tube tilted at pour time)
+* Grain 9, 184.0g gross, ?g net
+* Grain 10, 180.5g gross, ?g net
+