02-26-2017, 11:28 AM
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Freeform rocketry advocate.
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Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,780
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Quote:
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Originally Posted by tbzep
Grain geometry is not a copy, at least not of your products. You both used the proper proportion of length/diameter/core for your Bates grain with the motor diameter being the driving factor of the other measurements. If the geometry is off, you get spikes where you don't want them, burn throughs, etc. Those numbers have been around longer than either you or Dixon have been making motors.
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You will note that virtually every motor ever made has a BATES ratio somewhere near 1.7. Those produce a somewhat flat trace thus is more power efficient. Check your AT reloads and CTI reloads and check aspect ratios. The 1.25" long grain produces a regressive trace. The 38mm and 29mm reloads from AT are sized to match shipping mass restrictions.
If this subject interests you I have posted considerable tech data here:
http://v-serv.com/usr/custom/rr38mmCUSTOM.htm
Tech Jerry |