06-17-2018, 05:20 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Quote:
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Originally Posted by Royatl
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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Thank you for posting those measurements; I had suspected that they might have "meant the loaded [with expansion] size," but wasn't sure. I never saw a spiral-wound mini motor, but I think that was also about the time when they came in colored paper (blue and possibly also green--even the Estes "Firing Line" Vampire RTF starter set shown in the catalogs then had blue mini motors during that epoch). Also:
The current Quest Q-Jet motors have plastic cases, but as Klima showed, even composite motors can use paper cases successfully. Maybe in the future, Quest could also--not necessarily to replace the plastic-cased motors--make Klima-like motors of different "ratings." Even they might successfully use spiral-wound casings, if a sufficiently tough adhesive (phenol resin, maybe) was utilized. |