good rant, but you forgot the cumulative effect over 42 minutes of the reflected sonic booms. Assuming that the first one doesn't derail the car ... Sonic booms in a confined cylinder. John Willkie -----Original Message----- >From: flyback1 <flyback1@xxxxxxxxxxx> >Sent: Nov 1, 2006 12:51 PM >To: opendtv@xxxxxxxxxxxxx >Subject: [opendtv] Re: Mag-lev > >OK, all this theoretical stuff is just that. Theoretical. >To quote Monty Python, >"Stop That! It's Silly!" > >At 17,670 miles per hour the 'tube car' making a journey through the >center of the earth would need every life support system plus the >thermally protective ceramic tile outer surface the Space Shuttle has. > >It would also need the ability to physically withstand the very high >compression atmospheric pressure it would experience at that speed while >diving through a tunnel >going through the center of the earth. This is not like flying through >the outer atmosphere to get to space, it's far more intense. > >Another problem is the fact that as the thing passes the '50 mile deep >point' in it's travel toward the center of the earth the mantle gives >way to the molton core. >How are you going to build [much less run a tube car with human life >forms aboard through] a tunnel through the center of the earth that will >withstand the temperature and pressure of the molton core? >If you can do that, I can think of a lot better, more productive and >business savy applications for THAT technology. > >One other point: I suspect the occupants of the 'tube car' would >resemble broiled lobster when they reach China or what ever destination >is deemed proper. > >If you want to propose something rational and useful, why not try to >find a way to multiplex ultrawideband communications signals with >natural gas running through buried pink plastic pipes running under all >the city streets in the country? > > >John Shutt wrote: > >> http://www.damninteresting.com/?p=696#more-696 >> >> 17,670 MPH >> >> And a trip from any point to any other point would be about 42 minutes >> regardless of the distance between endpoints. >> >> John >> >> ----- Original Message ----- From: "Bob Miller" <robmxa@xxxxxxxxx> >> To: <opendtv@xxxxxxxxxxxxx> >> >> >>> How is this. Free fall is the absence of any resistance or counter >>> force to a body's obeying the laws of gravity. >>> >>> What speed would be reached as you pass the center? Anyone know? I don't >>> >>> Bob Miller >> >> >> >> > > > >---------------------------------------------------------------------- >You can UNSUBSCRIBE from the OpenDTV list in two ways: > >- Using the UNSUBSCRIBE command in your user configuration settings at >FreeLists.org > >- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word >unsubscribe in the subject line. > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.