Batch 2017-batch-08

24 grains of 38mm using erythritol, intended to be 6 reloads for the two 4-grain Loki-compatible cases I machined. With only 8 casting stands and coring rods, these will actually be cast in 3 sets of 8, but since they cure quickly, there's no reason not to do it all in one melt of 1500g.

Actually, we'll cast 2 sets with plain KNER, and then add 0.2% black iron oxide for the last set since at least one other experimenter seemed to like the results with that much BIO in the mix.

Grains 52mm with 2mm spacing, or 54mm casting tube length, using 0.5" Delrin coring rods.

Formula for a batch size of 1500g, with both uses in granular form from stock:

• 65% KNO3, 975g

• 35% Erythritol, 525g

• 0.2% black iron oxide, 1g, added to second third

• 0.4% black iron oxide, 2g, added to last third

This formula seems to pour best when heated to around 300F indicated on the Presto Multicooker.

These grains were cast on 29 September 2017.

Results

Average casting tube weight 1.92g.

• Grain 1, 54.46g gross, ?g net
• Grain 2, 54.88g gross, ?g net
• Grain 3, 55.28g gross, ?g net
• Grain 4, 53.25g gross, ?g net
• Grain 5, 53.80g gross, ?g net
• Grain 6, 56.02g gross, ?g net
• Grain 7, 52.54g gross, ?g net

• Grain 8, 53.49g gross, ?g net

• Grain 9, 53.47g gross, ?g net

• Grain 10, 53.97g gross, ?g net
• Grain 11, 54.70g gross, ?g net
• Grain 12, 52.78g gross, ?g net
• Grain 13, 53.20g gross, ?g net
• Grain 14, 55.52g gross, ?g net
• Grain 15, 53.47g gross, ?g net

• Grain 16, 53.00g gross, ?g net

• Grain 17, 51.93g gross, ?g net

• Grain 18, 53.08g gross, ?g net
• Grain 19, 53.35g gross, ?g net
• Grain 20, 53.20g gross, ?g net
• Grain 21, 55.24g gross, ?g net
• Grain 22, 55.48g gross, ?g net
• Grain 23, 56.38g gross, ?g net
• Grain 24, 55.85g gross, ?g net

Simulation says 4 grains of this with a #15 nozzle should be an 88% H-194 with about a 1.4 second burn.