07-21-2017, 12:41 PM
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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:
Originally Posted by stefanj
The instructions for the Nike-Patriot I'm building refer, in the step where the plastic launch lug is glued on, to the tube covering as "plastic."
I think the tube core is just really high quality paper. Dense, completely wrapped. No gaps.
Least-favorite tube has a brown inner layer that isn't complete; held together by the outer layer.
I wonder if Myke Bergenske would remember these details, or if Bill Stine could help.
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Other oddments for this thread:
* AVI produced its own motors for a short time. Same as the MPC motors, but with funky 1970s labeling.
* At least one MPC kit had, on the instruction sheet's suggested motor list, what appear to be FSI motors! D4, D6, etc. Were these really FSI motors, or vaporware MPC motors?
* Who designed and build the MRI / MPC / AVI motor making machine?
* What became of the 13 mm motor making machine? Or was were those motors made on the bigger machine with some kind of alternate tooling set?
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You may have solved this mystery with that one word ("plastic")--you jogged my memory of the scanned Nike-Patriot instructions on the Ninfinger Productions website. A high-quality spiral-wound kraft paper tube with a thin plastic overwrap (which might also have "soaked" into the upper layer of the paper, if the plastic was applied in a dissolved liquid [or molten] form) could also have the same physical characteristics as the MPC tubes, especially if the cured (or cooled & solidified) plastic was stiff (had a low elastic modulus). It would also--depending on its composition--be perfect for making strong plastic-to-plastic bonds (with the MPC styrene plastic launch lugs, for example), using ordinary plastic cement (if I recall correctly, the instructions called for using tube-type plastic cement).
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