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For Calliban re old mill video: https://newmars.com/forums/viewtopic.ph … 55#p230555
Thanks for that link! I had time to watch it, and appreciated both the presenter and the gent showing the property.
At the conclusion of the video, a figure of 100 years was given for the time since the mill was last used and today
Details about the kinds of wood used for various parts of the machinery were interesting.
I appreciated the detail about mills being lost due to explosion of the flour powder. I'd hear/read about such risks, but this puts the stories in context.
Assuming the demise of the mill occurred in 1924, that would have been after the end of the First World War, and industrialization would have been in progress on a large scale, so perhaps small operations like this mill could not generate enough income to survive, even though the property and equipment were paid for. Perhaps the demise is due to the lack of a young person willing to assume the responsibility. The supply of young people would have been severely reduced due to the war.
(th)
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For Calliban re material to transfer force to the space vessel main beam:
GW sent this suggestion by email:
Try some of Ed Pope's ZrO2/C "matech" heat shield material as "grab holds" spaced apart on the outside of the graphite or carbon-carbon engine shell (assuming it is also the pressure shell). It's strong, and it is low conductivity, and you don't shine photons where these "grab holds" are located. That reasonably-well isolates the white-hot carbon engine tube from the structures it attaches to. There is also the forward dome of this thing, which could be ever-cooler layers, against which the ship could bear. And you might even try holding it by its regeneratively-cooled nozzle.
If you have time, please evaluate this material to see if would be up to the job.
Regarding holding the nozzle seems to me likely to allow the heating chamber to separate from the nozzel.
Placing the force transfer devices on the side or on the dome would seem to me better able to keep the heating chamber attached to the nozzle.
The nozzle would be applying force to the bottom of the heating vessel, and the walls of that vessel would carry the force up to the frame of the ship via the devices to be specified.
(th)
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