# Batch 2017-batch-03 # 6 grains of 29mm using erythritol, intended to be a reloads for the longest GMA 29mm snap-ring case. Grain length 41mm with 1mm spacing per grain, so we'll make the casting tubes 42mm long. Delrin coring rods of 5/16" diameter. Formula for a batch size of 175g: * 65% KNO3, 113.75g, taken from the big bucket * 35% Erythritol, 61.25g The multi-cooker was preheated to about 250F with the lid on. Temp was increased during melting to 300F indicated. These grains were cast on 31 May 2017. Liner should be cut to 10.00" long for this 6-grain reload. Simulation says:
29mm 6-grain Erythritol #14
Rating:43% H-162Max Pressure:5.92 MPa (859 psi)
Total Impulse:216 NsSpecific Impulse:133 s
Max Thrust:206 NVolume Loading:70%
Average Thrust:162 NFuel Mass:165 g
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## Results ## Average casting tube mass 1.13g. * Grain 1, ?g gross, ?g net * Grain 2, ?g gross, ?g net * Grain 3, ?g gross, ?g net * Grain 4, ?g gross, ?g net * Grain 5, ?g gross, ?g net * Grain 6, ?g gross, ?g net With a 10.00" liner, 14/64" nozzle throat, buna-n o-rings, simulation says this makes a 37% H-156, 208 Ns, with about a 1.2 sec burn.