Nanotubes, Yarn Twist, Nanoscale Friction

Ross A. Finlayson wrote:


What do you think about electromagnetic gun launch to space?

snip


So anyways besides the
pulsed-power switching, then there are theoretical, not limits, just
issues,
about hypervelocity performance for the few seconds that the pod is in
the
atmosphere as it flies into space at Mach 30.


Yep.

Just issues.

LOL

Look at http://www.newworlds.com/reports/PUR-19.PDF

"Henri" wrote in message ...
Ross A. Finlayson wrote:


What do you think about electromagnetic gun launch to space?

snip


So anyways besides the
pulsed-power switching, then there are theoretical, not limits, just
issues,
about hypervelocity performance for the few seconds that the pod is in
the
atmosphere as it flies into space at Mach 30.


Yep.

Just issues.

LOL

Look at http://www.newworlds.com/reports/PUR-19.PDF

Hi,

I glanced through the paper that was suggested, the concept of the
railgun floating in the sky on electrified guy-wire pylons is nearer
the space elevator than the ETSMD on the laughability index. They do
have a lot of math in that paper, it looks useful.

I see you've already taken into account launching from as high above
sea level as feasible in your calculations. For a second I thought
there could be an improvement. I am looking at this table about air
pressu

http://www.engineeringtoolbox.com/25_462.html

Air pressure is not air density. The arid high-altitude desert has
less air density than the humid sea-level swamp. The Moon is a high
desert. Basically the idea with an ETSMD is to have it in Idaho or
perhaps Colorado, arid mountainous locations somewhat distant from the
center of Yellowstone Park, a large caldera.

The Chilean Andes are often profferred.

700 G's is a lot of force, increasing the pod mass to a hundred tonnes
(metric tons) with having the instant G shock is still a lot and maybe
too much. The launch track is generally considered to be evacuated,
but one tool that might be available is a plasma curtain that could
allow separate sections of the track to be at variously gradiated
pressures, or for the reusable shutter. The (a) problem with that is
that the pod flying through the coil in the presence of air at
hypervelocity would cause superheating of the air within the coils
from the overpressure.

If there was a method to diminish the air pressure in the path for
even half a kilometer it would help. Consider a plasma charge or
shock wave, either notion being high energy mechanics that would
benefit from big science primary research. Another idea is a focussed
infrared lamp of sorts that heats the air in the path as much as
possible in front of the Mach 30 2-100 tonne pod, pushing most of the
air away.

There already are coilguns being used to launch tank shells at Mach 5
plus. Another notion to consider is the EML assisted rocket launch,
where EML boosts the rocket to a speed where rockets then punch to
orbit, as has been done. There are inches of nanotube in the lab, and
it's highly promising for many things!

I guess that if the ETSMD would be a prototype for the people mover,
then there should be prototypes that basically launch slugs with
reentry parachutes into the sky. With a half a kilometer track and
seed money, and appropriate overflight permissions, a Meissnerized
ingot flies from coast to coast in less than half an hour, with zero
emissions.

http://hyperphysics.phy-astr.gsu.edu...lids/meis.html

If the magnetic field washes off the superconductor, it would be a
cold shower. Dietz mentions quench, consider it with respect to back
EMF, a big magnetic tub.

Dude: HEP.

Warm regards,

Ross F.