X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=blobdiff_plain;f=rockets%2Fresearch%2F2017-batch-04.mdwn;fp=rockets%2Fresearch%2F2017-batch-04.mdwn;h=a0e376fb91815c21e68d5fcb26c8b15319df6c88;hp=0000000000000000000000000000000000000000;hb=d905beaa8df6e988894de9a326687e567a7def48;hpb=4958d33687bbd22dbcef81293db00ab749b12536 diff --git a/rockets/research/2017-batch-04.mdwn b/rockets/research/2017-batch-04.mdwn new file mode 100755 index 0000000..a0e376f --- /dev/null +++ b/rockets/research/2017-batch-04.mdwn @@ -0,0 +1,40 @@ +# 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. + +Formula for a batch size of 135g: + +* 65% KNO3, 87.75g, taken from the big bucket +* 35% Sorbitol, 47.25g +* 1% RIO, 1.35g +* PolyStep B1, 2 drops + +Presto Multicooker operated at 275F indicated. + +These grains were cast on 1 June 2017. + +Simulation says: + +
+ +
29mm 4-grain Sorbitol #14 | |||||
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Rating: | 99% G-180 | Max Pressure: | 6.47 MPa (939 psi) | ||
Total Impulse: | 159 Ns | Specific Impulse: | 133 s | ||
Max Thrust: | 228 N | Volume Loading: | 69% | ||
Average Thrust: | 180 N | Fuel Mass: | 122 g | ||