X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=blobdiff_plain;f=rockets%2Fresearch%2F2020-batch-01.mdwn;fp=rockets%2Fresearch%2F2020-batch-01.mdwn;h=0000000000000000000000000000000000000000;hp=f66091a0e689300f9c8aed0215c01426cff32606;hb=8b5b14fb20cbc68313427127532a8241c920a586;hpb=7357678e1fb78cfbd42b39c882b114a1ca5a95f6

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-# Batch 2020-batch-01 #
-
-8 grains of 75mm KNSB, intended to be a reload for my long purple case.
-with Loki-style #58 nozzle.  Grain length 5.125" with 0.125" spacing per 
-grain planned using o-rings.  Delrin coring rods of 0.75" diameter since 
-that's what I have bases and caps for, then bored out to 0.875" final ID 
-before assembly.
-
-Kuker's Motorsim says this should be a 43% M-2690 with a slightly progressive
-burn about 2.5 seconds long, using 5355g of propellant or 73% volume loading,
-and a max pressure of 825 psi.
-
-Since this is too much propellant to handle in one batch, we'll plan to use
-two 2700g batches, the formula for each of which is:
-
-* 65% KNO3, 1755g
-* 35% Sorbitol, 945g
-* 1% red iron oxide, 27g, added after melt
-* 41 drops Polystep-B1, added before pour using eye dropper
-
-This formula is completely fluid with 225F indicated on the Presto Multicooker,
-but viscosity is noticeabley lower making for easier pouring at 250-275F.
-
-These grains were cast on 2020.08.31.
-
-## Results ##
-
-The 5.125" grains were poured to a 119mm fill line, and then an 0.75" Delrin
-coring rod was twisted down into the goo puncturing foil over the coring rod
-hole at the grain base.  About 18 hours later, the grains were "topped off" 
-and smoothed level to compensate for shrinkage.  The coring rods were pulled 
-about 48 hours after casting, and each grain was observed to have some bubbling 
-around the base of the coring rod, presumed to be due to air below the foil on 
-the casting base pushing up as the rod went down.  We should arrange for 
-explicit venting of that in the future.  The top faces of the grains were knife
-scraped smooth, the cores were bored out to 0.875", and the bottom of each grain 
-was chamfered around the core to eliminate the bubbly bits.  Thus, the grain 
-masses were highly likely to be less than anticipated.
-
-* Grain 1, 630g gross, 16.21g casting tube, 613.79g net
-* Grain 2, 634g gross, 16.20g casting tube, 617.80g net
-* Grain 3, 640g gross, 16.14g casting tube, 623.86g net
-* Grain 4, 632g gross, 16.17g casting tube, 615.83g net
-* Grain 5, 626g gross, 16.34g casting tube, 609.66g net
-* Grain 6, 628g gross, 16.11g casting tube, 611.89g net
-* Grain 7, 628g gross, 16.17g casting tube, 611.83g net
-* Grain 8, 636g gross, 16.28g casting tube, 619.72g net
-
-Average casting tube weight 16.2g.  Measured total propellant mass of 4924g, 
-or about 616g per grain, which is 92% of what Kuker's simulator projected.
-
-Borrowed Terry's Loke #58 nozzle, which is a few thousandths over-sized.
-
-The as-built motor is projected to be a 30% M-2300 or so.
-
-Flight attempted at Airfest 2020 on Monday morning, CATO just off the rail.