Maglev trains
Tim Walters
of sound?
Thanks in advance for any input.
Tim
Sorcerer
"Tim Walters" <timwa...@terraform.es> wrote in message
news:a2qff.t...@news.alt.net...
Apart from the same problems associated with aircraft, do you mean?
One that comes instantly to mind is tunnels. Pushing air ahead through
a tunnel at the speed of sound would require an enormous amount
of energy, and the drag doesn't help as the air refills the tunnel behind
the train. However, that can be overcome by slowing the train solely
for the tunnels. The next problem is curves. Experiments were
carried out in Britain that allowed trains to tilt at high speed, but
were scrapped.
Then there is the social problem of sonic booms, which is really
a technical problem.
People would not like having broken windows everyday, and they'd
be much closer to the source so medical problems as well with burst
ear drums.
Concorde was banned from flying supersonic over land for that
reason or it would be flying New York to Los Angeles at 40,000 ft
today instead of being scrapped, and a sonic boom from 40,000 ft
is merely a minor nuisance. You have two chances of ever seeing it
happen except as an experiment on the Great Salt Lake or similar
remote flat surface with a straight path, fat and slim, and investors
would be fools to put money into it.
Androcles
Tim Walters
be any tunnels and, moving at less than the speed of sound, there wouldn't
be any sonic boom.
(Though, while we're on the subject, why not put the monorail inside a tube,
suck the air out ahead of the trains, and run them through at Mach 2?)
I know maglev trains use a lot of power, but wouldn't there be a plentiful
supply of energy from wind, waves and tide?
I notice that most existing maglev trains go up to speeds of around 500 kph.
I wondered if there was some technical reason why they don't go faster.
Tim
"Sorcerer" <Headm...@hogwarts.physics_b> wrote in message
news:%BxNg.50512$H03....@fe3.news.blueyonder.co.uk...
dbo...@mindspring.com
I once attended a maglev conference and one of the biggest obstacles to
really high speed maglev is the radius of curvature on curves to keep
the g forces down to something reasonable. This made the curves REALLY
LARGE exacerbating the already absurd costs of a couple billion
dollars/mile. For that sort of cost, development of high speed
conventional rail is easy. Maglev trains are a solution in search of a
problem.
Sorcerer
| What I was thinking of was a maglev railway built offshore. There wouldn't
| be any tunnels and, moving at less than the speed of sound, there wouldn't
| be any sonic boom.
Then you've given up your first requirement, "near the speed of sound".
Corrosion becomes a problem. Salt water is nasty, ship fittings are
stainless
steel these days.
| (Though, while we're on the subject, why not put the monorail inside a
tube,
| suck the air out ahead of the trains, and run them through at Mach 2?)
Then you need powerful fans, which kinda makes jet engines on planes
a better deal.
| I know maglev trains use a lot of power, but wouldn't there be a plentiful
| supply of energy from wind, waves and tide?
Only if you harness it first. People are working in that.
http://tinyurl.com/k6kxp
|
| I notice that most existing maglev trains go up to speeds of around 500
kph.
| I wondered if there was some technical reason why they don't go faster.
|
| Tim
Sure there is. I've given you a couple of reasons, curves and tunnels.
There is no electrical or magnetic reason, if that is what you are asking.
The thing is, son, almost anything is possible, but the objective is
to move people from A to B in a cost-effective manner. That includes
construction, maintenance, running costs, speed, energy... in short,
engineering... and then capital investment.
What do you want a train for, anyway? Why not rail buses, taxies and
trucks operated by computers? Goods could be shipped overnight to
anywhere without a driver, it takes large trucks off the roads, all we need
is more rail in cities. We have the main arteries which are currently
under-used, built with steam and safety in mind, and we have the technology.
Each vehicle could communicate with a central computer via cell phone
and know where it is from GPS. Complex as a system, simple as an idea.
Androcles
Sorcerer
<dbo...@mindspring.com> wrote in message
news:1158071518.7...@b28g2000cwb.googlegroups.com...
Yep...
Androcles.
G=EMC^2 Glazier
problem. Planes creating a sonic boom can cause a million dollars worth
of damage breaking building windows an usually the rear windows of cars
flying to low Not sure what the limit speed is for a "linear
induction motor" The coils on the train generate a magnetic field in
which the poles shift along the train. This field induces electric
currents in the reaction rail,which in turn generates its own field.
Thus the two fields interact so that the shifting field pulls the
"floating"(no friction) along the track. Tricky part I see with this is
how fast the poles shift,and that could be its speed limit. Reality
is I have a curtain that uses an induction motor. They have been around
for about 85 years. Your car starting motor(Bendix) is using an
induction motor,and a few years go this guy used it to make a very
fast(fastest in the world machine gun) Feel like typing so I'll add
this a mouse was levitated by a magnetic field That proves there is
some magnetizim in just about everything Go figure Bert.
hanson
news:21480-450...@storefull-3333.bay.webtv.net...
> Reality is I have a curtain that uses an induction motor. They have
> been around for about 85 years.
> magnetic field That proves there is some magnetizim in just
> about everything Go figure Bert.
>
.... AHAHAHAHA... keep on figuring, Herbie... ahahaha...
especially in view of your 85 year old curtains (ever washed
them?) with your levitated mouse and your proofs...
Now then Herbie, keep feeling like typing and keep doing
so until you have answered the levitating question in here:
http://groups.google.com/group/sci.physics/msg/c63950ab858592a7
Don't get tired on me now Herbie, or I will ask you why.
ahahaha... ahahahanson
G=EMC^2 Glazier
laugh. Bert
hanson
<herbert...@webtv.net> groaned in message
news:22870-45...@storefull-3333.bay.webtv.net...
> Hanson I could never get tired of you. You are a joke. You make me
> laugh. Bert
>
>
ahahaha... Herbie, Hebie, Herbie. Good, then laugh some more.
But don't make a joke in your answer to the question about Israel.
Here are the details.
http://groups.google.com/group/sci.physics/msg/c6dee513388f68a6
All the links cited therein have the common denominator which says:
*** ... oye-weh-Zion Glaser's God is Israel. *** He is one of those
kikes who live in the US, but who do live & operate by the belief of
----- "Israel First, then maybe, just maybe, the USA 2nd" ------
oye-weh-Zion Glaser's own whinings stated in HIS own words that:
::B:: "I stuck up for Israel"
::B:: "We do need the help of Israel to help us"
::B:: "Being Jewish I know this is so very true".
::B::"Go Figure" .... Jews use that term".
::B:: "I do know how every thing works,
::B:: and pass this information on"
::B:: "Why.. am I not loved by all?" Bert
Now then Bert, since you "know" and you yearn to be "loved",
I think you perhaps will be so, AFTER you "pass on" the
------ answer to why ------
"...the USA, which is paying to Israel 3-7 Billion $$$US tax
money each year for the last 60 years & an equal $ amount
to the muslim ass-venters to placate and pacify them so that
they don't continue to kick Jew ass, does beg the question:
==== What are all these BILLIONS of US tax-payer dollars
buying the American public, besides continuous terrorism,
mayhem and war where Jews are being connected to or
involved in ? --- What good or benefit has come in return to
the American taxpayers from Israel for all that tax money that
came off the tables from poor American families?"
------- answer that, oye-weh-Bert -------
hanson
Jeff…Relf
Praise Jesus ! the U.S. won WWII, gaining control of the " Holy Land ".
A lot of countries wanted the oil and relics in the Middle East,
but it was the U.S. that got them.
The U.S. is the true _Lord_ of the Middle East,
more powerful than Allah or Christ ever were.
As the land _Lord_ of the Mideast, it collects rent ( including oil ),
" evicts " ( kills ) whomever it will... laying down the law.
T Wake
news:Jeff_Relf_200...@Cotse.NET...
> For Fuck's sake Ha_Ha_Hanson... Why do you keep asking the same question ?
>
> Praise Jesus ! the U.S. won WWII, gaining control of the " Holy Land ".
> A lot of countries wanted the oil and relics in the Middle East,
> but it was the U.S. that got them.
Can we add History to the list of subjects you find it difficult to grasp.
Unless of course you have some "nonstandard" concepts of where and when WWII
was fought. Do you agree with the normal view that WWII ended in 1945?
> The U.S. is the true _Lord_ of the Middle East,
> more powerful than Allah or Christ ever were.
Does that make you feel good?
> As the land _Lord_ of the Mideast, it collects rent ( including oil ),
> " evicts " ( kills ) whomever it will... laying down the law.
Really?
tadchem
Jeff...Relf wrote:
> For Fuck's sake Ha_Ha_Hanson... Why do you keep asking the same question ?
>
> Praise Jesus ! the U.S. won WWII, gaining control of the " Holy Land ".
The British controlled the area from 1920 on until the United Nations
divided it up and gave a piece to the Jews - sort of a blood payment
for their suffering during the Holocauset.
http://en.wikipedia.org/wiki/Palestine#British_Mandate_.281920-1948.29
http://en.wikipedia.org/wiki/Palestine#UN_Partition
> A lot of countries wanted the oil and relics in the Middle East,
> but it was the U.S. that got them.
The US got squat out of that. There is no oil in Israel.
> The U.S. is the true _Lord_ of the Middle East,
> more powerful than Allah or Christ ever were.
The US is 'friends' with Israel. Israel also has many old enemies in
the area, who in turn hate the US for supporting Israel. Bobby Kennedy
was murdered in 1968 to punish the US for its support of Israel during
the 1967 war.
> As the land _Lord_ of the Mideast, it collects rent ( including oil ),
> " evicts " ( kills ) whomever it will... laying down the law.
Much (if not most) of the Middle Eastern oil goes to Europe, especially
those countries (France, Germany, etc.) who refused to back the US on
the overthrow of Saddam. The US still hasn't gotten a drop of Iraqi
oil since then.
Tom Davidson
Richmond, VA
hanson
.... ahahaha... #2 if, yes then don't read han...@quick.net
.... ahahaha... #2 your comment is the same you gave yesterday
.... ahahaha... #3 your comment now and then does not answer
the question....
>
"Jeff.Relf" <Jeff...@Yahoo.COM>, the Jerk, wrote in message
news:Jeff_Relf_200...@Cotse.NET...
.... ahahaha... #4 here is how I answered you the first time, Jerk:
http://groups.google.com/group/sci.physics/msg/be3d3b34e24190ae
wherein ity says:
[hanson]
::: == What good or benefit has come in return to the American
::: taxpayers from Israel for all that tax money that came off the
::: tables from poor American families ?
--------- answer it without diversions, Jerk -------------
BYW, Jerk, how much oil and money comes from Israel to the US?
G=EMC^2 Glazier
dry low density.If the trains body fitted in snugly,and the walls of the
tunnel were electromagnetic the train would act like a particle in an
accelerator. That would make 10,000 mph easy. Go Figure Bert
hanson
<herbertglazier @ webtv.net> pontificated in his message
news:4965-450...@storefull-3331.bay.webtv.net...
> Go Figure [and he said earlier that] In all fairness Monica
> Lewinsky would be the first Jewish woman president.
> When it comes to fucking my county republicans do it best.
> Go figure Bert
[hanson]
ahahaha.... ahahaha.... AHAHA... Herbie Herbie, Herbie.
But Herbie, whether that little obese yenta would be
president or not, it is widely believed that it is you, the
Jews, who do fuck the US the best... and deprive those
loud, complaining welfare basket cases like **Jeff Relf **
from their cut... which is why you should explain to us why
you praise & adore Israel into high heaven, yet you are NOT
able or willing to give an even simple answer to the question
re: Israel, and instead you do scream more 'Heil Zion', usually
accompanied by your seeding & fomenting of more
Anti-Semitism with your nasty and extremely bigoted
comments instead of answering the simple question:
== What good or benefit has come in return to the American
taxpayers from Israel for all that tax money that came off the
tables from poor American families?"
== "...the USA, which is paying to Israel 3-7 Billion $$$US tax
money each year for the last 60 years & an equal $ amount
to the muslim ass-venters to placate and pacify them so that
they don't continue to kick Jew ass, does beg the question:
==== What are all these BILLIONS of US tax-payer dollars
buying the American public, besides continuous terrorism,
mayhem and war where Jews are being connected to or
involved in ?
------- answer that, oye-weh-Bert -----
PS: in one of your recent nasties, instead of you answering
the above, you said: "Why don't you go to Iran and protect
bin Larden." ... But Herbie, a much more pertinent comment
by you would have been why it is that that one of the "Ten most
Wanted" on the FBI list happens to be a TERRORIST JEW by
name of Adam Pearlman from Riverside, California, aka.
Adam Yahiye Gadahn who is Al Qaida's #3 chieftain. This Jew
turned Muslim threatened that LA and Melbourne will be the
next target of terrorist attacks and "much less compassionate"
then the London & Spain massacres were.. see: 09-12-05
abclocal.go.com/kabc/news/ 102904_nw_american_alQaeda.html
http://groups.google.com/group/sci.physics/msg/31400b26f8948943
Sorcerer
Yeah, sure. There are lots of tunnels in deserts and at the top
of the Himalayas, the Andes and the Alps, to say nothing
of the whole continent of Antarctica. Let's build tunnels
for Maglev trains where there are no passengers or freight
to move.
Did anyone ever tell you that you are fuckhead?
George Orwell
I would just like to say that I think sci.physics is lucky to have
Hanson's posts, but that they should be cross-posted to soc.culture.usa,
and other venues, where they can do even more good.
edi...@netpath.net
ill-fated attempt around 1970 to develop an elevated monorail system of
rapid transit for that area. It just got further and further over
budget, further and further behind schedule, and increasingly obviously
impractical. Its impracticality was obvious to almost anyone with
mechanical skill. Nonetheless, very few politicians would stand up to
the "we can't cut it now that we have so much invested" argument -
particularly as so many big Pittsburgh corporations were major
contractors on Skybus, which eventually went as far as a demonstration
project at South Park. Eventually - after a fortune down the rathole -
it was canceled.
No $4 to park! No $6 admission! http://www.INTERNET-GUN-SHOW.com
Sorcerer
<edi...@netpath.net> wrote in message
news:1158534788....@i3g2000cwc.googlegroups.com...
Yes, well... Pittsburgh's Mt. Washington has a funicular railway... terrain
is a pretty good deterrent to maglev trains and monorails.
hanson
news:021568b2dd3ce625...@mixmaster.it...
> I would just like to say that I think sci.physics is lucky to have
> Hanson's posts, but that they should be cross-posted to
> soc.culture.usa, and other venues, where they can do even
> more good.
>
Ahhh, you are a good sport, Georgy, from the land of the Ceasars.
But I am quite content to post here in sp and I delegate the authority
to you to handle all the international cyber traffic in those cultural
and political news groups.... I might come to shower praise or
to cry if/when there is actually decent answer posted to my simple
question above. Thanks for your good intensions & actions, Orwell!
hanson
Jeff…Relf
Collectively, the U.S. and its partners ( including the IMF ! ) are
The real Devil_God of the Middle East... making Allah and Jehovah look small.
Isreal and Saudi Arabia are under their thumb, controlling the region.
The U.S. and it's partners won WWII,
gaining control of the oil in the " Holy Land ".
They collect rent in the form of oil ( which they lust for like junkies ).
They lay down the law and evict ( or kill ) whoever they please.
hanson
ahahaha ... in response to the question in my message in
http://groups.google.com/group/sci.physics/msg/3129ec77e405b794
Jeff, your quaint belief that the world works and runs according
to the twisted rules of you, Jeff Relf, a notorious child-support
delinquent and long term welfare recipient, is a bit pedestrian
and gauche. ....ahahahaha... But thanks for your help to spread
this question, Jeff... even with your limited acumen, because
your tripe nicely enhances and shows the urgency for normal
people to seek and post an answer to the quesion:
== What good or benefit has come in return to the American
taxpayers from Israel for all that tax money that came off the
tables from poor American families?"
== "...the USA, which is paying to Israel 3-7 Billion $$$US tax
money each year for the last 60 years & an equal $ amount
to the muslim ass-venters to placate and pacify them so that
they don't continue to kick Jew ass, does beg the question:
==== What are all these BILLIONS of US tax-payer dollars
buying the American public, besides continuous terrorism,
mayhem and war where Jews are being connected to or
involved in ?
------ ahahaha... ahahaha..., Thanks, Jeff, ahahaha --------
"Jeff.Relf" <Jeff...@Yahoo.COM> wrote in message
news:Jeff_Relf_200...@Cotse.NET...
Jeff…Relf
I'm just answering it everytime you ask Bert the same fucking question.
It's simple macroeconomics... as predictable as the orbits.
The IMF countries lust for oil like strung-out junkies;
but the U.S. and its allies have controlled Middle Eastern oil since WWII.
They've made Isreal and Saudi Arabia, " pawns in the Holy Land ".
Compared to such powers of eviction ( and execution ),
Yahweh ( a.k.a. Jehovah, יהוה ) and Allah ever looked so small.
WikiPedia.ORG/wiki/Yahweh
The fact that I've received free food ( and nothing more )
is of little consequence to this discussion.
As for child support, my ex left me becuase I wouldn't feed her
addiction to popping out kids ( a vice worse than drugs );
so not enabling her ( very Mormon ) habit was the least I could do for society.
You should thank me.
hanson
After all, Jeff, proselytizing is in your blood. You have the
needed background. Your role model, Glaser, the Zionist bigot,
and you, Jeff, as his evangelical slave, are perfect vehicles.
"Jeff.Relf" <Jeff...@Yahoo.COM> a notorious child-support
delinquent and long term welfare recipient wrote in message
news:Jeff_Relf_200...@Cotse.NET...
> I'm not helping you spread your oft-repeated question,
>
[hanson]
ahahaha... But and yes you do. You do not only spread it but
you are a cause and reason for disseminating the question
in my post which was:
== What good or benefit has come in return to the American
taxpayers from Israel for all that tax money that came off the
tables from poor American families?"
== "...the USA, which is paying to Israel 3-7 Billion $$$US tax
money each year for the last 60 years & an equal $ amount
to the muslim ass-venters to placate and pacify them so that
they don't continue to kick Jew ass, does beg the question:
==== What are all these BILLIONS of US tax-payer dollars
buying the American public, besides continuous terrorism,
mayhem and war where Jews are being connected to or
involved in ?
http://groups.google.com/group/sci.physics/msg/5a611859fb015d7a
ahahaha... ahahahanson
tadchem
Actually, they would work best in a vacuum.
If the air density is non-zero, then the train *still* has to push the
air in front of it out of the way. Inside a tunnel this would be a
problem, and would effectively limit the train to sub-sonic speeds.
Leave the train out in the open, and the air can easily be pushed out
of the way to the side.
Tom Davidson
Richmond, VA