preliminary data for new KNSB+RIO fuel batch for test burns

[web/gag.com] / rockets / research / 2019.11.23.mdwn

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+# Batch 2019.11.23 #
+
+A solid slug of KNSB propellant cast in PML 75mm coupler tube, intended to be
+cut into 1" long grains to be used in James' ballistic test motor.  For
+6 grains, thinking about saw kerfs and shrinkage, we'll try casting about a 7" 
+length.  That calculates to about 1321g.
+
+After trying with and without RIO last year, then losing the notes on which 
+tests were which, I'm kind of starting over.  For prior with-RIO motors, I 
+used 1% RIO and about 1.5 drops per 100g of Polystep-B1 surfactant.  At this
+motor size, I don't think the surfactant is useful, but I do think some RIO
+helped with igniteability.  So this time, let's try running with less RIO 
+and no surfactant.  Like 0.25% RIO.
+
+Formula for a batch size of 1325g:
+
+* KNO3, 859.10g
+* Sorbitol, 462.59g
+* red iron oxide, 3.31g
+
+This formula is completely fluid with 225F indicated on the Presto Multicooker.
+
+## Results ##
+
+These grains were cast on 23 November 2019, in the wee hours.
+
+The actual measures of the batch (using shipping scale for primary ingredients
+and my 0.01g resolution scale for the RIO) were:
+
+* KNO3, 860g
+* Sorbitol, 462g
+* red iron oxide, 3.4g
+