Talk:Vactrain
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[edit] Mach Numbers in Vacuo?
Mach number is the ratio of velocity (either fluid flow, or of a body) to the speed of sound in the medium. This is meaningless if there is no medium through which sound waves can travel, and it is incorrect to express the speed of a vehicle travelling in a vacuum as a Mach number. Gordon Vigurs 16:59, 31 May 2006 (UTC)
The speed of sound in a gas is dependent on the temperature, density and type of gas. Although the pipes will be close to a vacuum they will not be perfect (typically 0.1 to 0.00001 atmospheres). Also they will be predominantly small molecules such as helium (Due to gasses permeating through the casing). There will be a measurable speed of sound but it will be very different to speed in air at standard temperature and pressure. I guess use of Mach number in this case was for simple comparison to standard aircraft travel and not as a direct indication of actual speed compared to any sound waves in the medium. Jodysdad 21:52, 10 November 2006 (UTC)
- You are correct, but even more pedantic than I. Gordon Vigurs 18:34, 25 November 2006 (UTC)
[edit] Conspiracy theories?
"(Some researchers, however, such as Richard Sauder, John Rhodes, Bill Hamilton and TAL, have contended that a nation wide tube-shuttle network has been built by the U.S. military to assure Continuity Of Government [COG] operations during or after a major war on U.S. soil)." That's a pretty big claim to just drop in without any links to sources. 67.160.28.212 16:23, 27 October 2006 (UTC)
- the sources are right there in the part you quoted. big difference between Wikipedia asserting a conspiracy (?) theory and Wikipedia asserting that four researchers asserting the same theory. 207.29.128.130 14:34, 20 November 2006 (UTC)
[edit] Genesis II
The movie "Genesis II" and its sequel, "Planet Earth", produced by Gene Roddenberry, featured the "sub-shuttle". Although station sections of tunnels appeared to be pressurized, it could be that sections were pressurized around stations to allow an open platform. A pair of doors could operate on each side of a station, closing behind a train and opening in front and letting in air.
In the late 1970s/early 1980s, so the 1973 movie postulates, the first one has been completed across the United States, with a station at Carlsbad Caverns. When Dylan Hunt awakens in 2133, he discovers that before civilization broke down, a worldwide network had been completed. Unmade further sequels, for which scripts were written, includes one adventurous crossing of the Atlantic with parts of the tunnel partly submerged. My above comment about pressurizing sections runs into trouble when Dylan Hunt drives the sub-shuttle by himself from Terrania back to Pax (at Carlsbad) and has trouble stopping because he didn't start deceleration soon enough. GBC 05:05, 19 November 2006 (UTC)
