06-16-2018, 06:24 PM
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SPEV/Orion wrangler
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Join Date: Mar 2005
Location: Atlanta, GA
Posts: 2,645
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Quote:
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Originally Posted by blackshire
When the dimensions (0.69" [it may be 0.690"] x 2.75") were given in the Estes catalogs, I wonder if they were for the casings before they were filled? Your midsection (propellant section) measurements match theirs perfectly.
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Just got out a couple of Semroc spacer tubes. They're spiral, but otherwise same as a casing. I think Carl was going to see if spirals could be used for his motors (I told him about the 1972 Estes mini motor experiments). And Carl told me he got them from the same company that does Estes' casings. one is 0.691 +- 0.001. The other is 0.688 +- 0.0005.
But yes, I think the Estes tubes may have been 0.685 empty with planned expansion through loading.
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Roy
nar12605
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