X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=blobdiff_plain;f=rockets%2Fresearch%2F2017-batch-03.mdwn;h=096f6bfcb838d8eb7725603075b20d63ab00509f;hp=b390854c016cf0344da0774710ff89edcf37208a;hb=b741d1a32d9390b08a72bc388094a00713b576a3;hpb=c3209ea421e038c69530f8f7e085d842dc212eda

diff --git a/rockets/research/2017-batch-03.mdwn b/rockets/research/2017-batch-03.mdwn
index b390854..096f6bf 100755
--- a/rockets/research/2017-batch-03.mdwn
+++ b/rockets/research/2017-batch-03.mdwn
@@ -14,26 +14,38 @@ 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:
+
+<!--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 (859 psi)</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>
 
 ## Results ##
 
-* 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
+Average casting tube mass 1.13g.
 
-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.
+Coring rods extracted easily, new hickory tube caps came off without too
+much effort.  Slight cleanup at the top of each grain since propellant always
+seems to fillet around the coring rod.  Grain average fill levels looks pretty
+good, with on the order of 1mm space at the top as expected.
 
-<!--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-->
+* Grain 1, 26.57g gross, 25.44g net
+* Grain 2, 26.63g gross, 25.50g net
+* Grain 3, 26.65g gross, 25.52g net
+* Grain 4, 26.01g gross, 24.88g net (visible undefill)
+* Grain 5, 26.51g gross, 25.38g net
+* Grain 6, 26.75g gross, 25.62g net
 
-<!--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>
+Total of 152.34g propellant, vs 159g simulated.
+
+Note that after casting grains and cutting a liner to 10.0", I realized I'd
+mis-measured the case, and we actually had 10.4" of liner/propellant length
+to play with!  Fix this for the next time we make grains...  For now, we'll
+fly these grains in a correct length liner and live with the fact that we 
+could have put another 0.4" of propellant in the case!  That'd be another
+13 Ns according to the simulator...
+
+With a 10.40" liner, 14/64" nozzle throat, buna-n o-rings, simulation says
+this reload will be a 37% H-155, 208 Ns, with about a 1.2 sec burn.