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Joined 1 year ago
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Cake day: June 18th, 2023

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  • Oh man yeah welded joints are just falling apart every week, it takes a fortune to upkeep some stationary metal.

    I dont think you understand air’s role in aerodynamics. At half atmosphere…you’ve plainly removed half the friction, there is half the air molecules to collide with the train. To give some perspective, all of the fastest manmade vehicles, by crazy high magnitudes of difference, are space vehicles. The ISS is whizzing around at nearly 5 miles a second in low earth orbit. Air is the limiting factor in speed. Its the only reason any additional fuel needs burning to maintain speed.

    Finally…youre not gonna have a fire in a vacuum tube






  • its a big topic, just be aware that “vacuum” in the real world is a sliding scale of air pressure. vacuum tube doesnt automatically mean conditions on a spacecraft in sci-fi when a hole is shot through a window. You can cut air pressure to half of atmospheric, and have an extremely weak vacuum, and still get amazing efficiency gains. We already have routine transit of pressurized cabins in the form of planes.