From: Bdale Garbee <bdale@gag.com>
Date: Thu, 1 Jun 2017 00:16:32 +0000 (-0600)
Subject: 29mm KNER batch
X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=commitdiff_plain;h=eebbb70cf14ef9448fc3d0934072343d4e5d1710

29mm KNER batch
---

diff --git a/rockets/research/2017-batch-03.mdwn b/rockets/research/2017-batch-03.mdwn
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+# 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.
+
+## Results ##
+
+* Grain 1, 176.1g gross, ?g net
+* Grain 2, 187.8g gross, ?g net
+* Grain 3, 187.6g gross, ?g net
+* Grain 4, 185.8g gross, ?g net
+* Grain 5, 187.9g gross, ?g net
+* Grain 6, 188.3g 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.
+
+<!--Begin motor 29mm 6-grain Erythritol #14 HTML export from MotorSim-->
+<table class='motor' style='text-align: left; border: 1px solid black'><tr><th colspan='6' class='title'>29mm 6-grain Erythritol #14</th></tr><tr class='summary'><th>Rating:</th><td>43% H-162</td><th>Max Pressure:</th><td>859 psi</td></tr><tr class='summary'><th>Total Impulse:</th><td>48.5 lbf·s</td><th>Specific Impulse:</th><td>133 s</td></tr><tr class='summary'><th>Max Thrust:</th><td>46.4 lbf</td><th>Volume Loading:</th><td>70%</td></tr><tr class='summary'><th>Average Thrust:</th><td>36.4 lbf</td><th>Fuel Mass:</th><td>5.82 oz</td></tr><tr><td colspan='4' class='thrust'><img src='http://chart.apis.google.com/chart?chxt=x,x,y,y,r,r&chs=400x200&cht=lxy&chco=3072F3&chds=0,1.36,0,206.37&chxr=0,0,1.36|2,0,206.37|4,0,46.39&chd=t:0,0,0.03,0.07,0.11,0.17,0.25,0.36,0.52,0.69,0.73,1.05,1.2,1.21,1.21,1.21,1.21,1.21,1.21,1.21,1.21,1.27,1.36|0,11.17,113.77,132.54,140.92,151.05,164.61,181.51,198.8,206.37,206.02,177.47,152.17,142.48,132.97,123.64,114.51,105.58,96.88,88.42,80.21,1.09,0&chxl=1:|s|3:|N|5:|lbf&chxp=1,50|3,50|5,50' width='400' height='200' alt='null' /></td></tr></table>
+<!--End motor 29mm 6-grain Erythritol #14-->
+
+<!--Begin motor 29mm 6-grain Erythritol #14 HTML export from MotorSim-->
+<table class='motor' style='text-align: left; border: 1px solid black'><tr><th colspan='6' class='title'>29mm 6-grain Erythritol #14</th></tr><tr class='summary'><th>Rating:</th><td>43% H-162</td><th>Max Pressure:</th><td>5.92 MPa</td></tr><tr class='summary'><th>Total Impulse:</th><td>216 Ns</td><th>Specific Impulse:</th><td>133 s</td></tr><tr class='summary'><th>Max Thrust:</th><td>206 N</td><th>Volume Loading:</th><td>70%</td></tr><tr class='summary'><th>Average Thrust:</th><td>162 N</td><th>Fuel Mass:</th><td>165 g</td></tr><tr><td colspan='4' class='thrust'><img src='http://chart.apis.google.com/chart?chxt=x,x,y,y,r,r&chs=400x200&cht=lxy&chco=3072F3&chds=0,1.36,0,206.37&chxr=0,0,1.36|2,0,206.37|4,0,46.39&chd=t:0,0,0.03,0.07,0.11,0.17,0.25,0.36,0.52,0.69,0.73,1.05,1.2,1.21,1.21,1.21,1.21,1.21,1.21,1.21,1.21,1.27,1.36|0,11.17,113.77,132.54,140.92,151.05,164.61,181.51,198.8,206.37,206.02,177.47,152.17,142.48,132.97,123.64,114.51,105.58,96.88,88.42,80.21,1.09,0&chxl=1:|s|3:|N|5:|lbf&chxp=1,50|3,50|5,50' width='400' height='200' alt='null' /></td></tr></table>
+<!--End motor 29mm 6-grain Erythritol #14-->
+</p>
+