# 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>