There should be a place for SE in NASA's Mars plan: http://www.space.com/news/060706_mars_report.html...
7410
hetrevillion
Jul 10, 2006 2:42 pm
... orbit. ... could cost less than send goods to the space (orbit). ... earth. ... As in my last post, where do the re-entry bodies come from? If launched...
7411
hetrevillion
Jul 10, 2006 2:47 pm
... The mentioned 1-2 km. size is the diameter of the aerostat. He said one mile, actually. het ... Could the CNTs be woven into a fabric and made airtight?...
7412
Andreas
awnd329
Jul 10, 2006 10:52 pm
... large ... So, a single 1 km diamater balloon is going to lift up a 1-2 thousand km track made of magnets? I would like to see that calculation. ... I'd bet...
7413
Edward Brophy
faustic
Jul 11, 2006 11:41 am
... distance, ... and ... I remember a caller on The Space Show suggesting a circular mass accelerator but he hadn't figured out several problems such as ...
7414
Andreas
awnd329
Jul 14, 2006 3:19 am
... Interesting idea. But, then, the reason the linear accelerator needs to be so long is the g-force limit. Making it circular does not solve that at all. ...
7416
R.K. Hardman
dilettantelu...
Jul 16, 2006 5:46 pm
http://www.space.com/businesstechnology/technovel_nanotubes_060602.html [Non-text portions of this message have been removed]...
7417
Herbert Murray
hcm1955
Jul 16, 2006 7:08 pm
CNTS may have a strength of 300 GPA. If you look at Blaise Gassend paper on Exponential Tethers we may only need about 50 GPA. CNT/Nanotech research is still...
7418
kyros
terenot
Jul 16, 2006 7:12 pm
This has been discussed extensivly in the space elevator world. If you can find Brad Edward's reply to it, it's well worth reading. Space.com is about 2 months...
7419
Brian Dunbar
economic_ref...
Jul 16, 2006 7:15 pm
... Downer? Nah. Interesting data? Yes. See Liftport's response by Tom Nugent at http://www.liftport.com/progress/wp/?p=839 -- Brian Dunbar System...
7420
Ed Minchau
spider_boris
Jul 16, 2006 8:01 pm
One problem with Pugno's study is that it assumes a requirement for individual nanotubes to be very long. However, imagine for a moment that a short nanotube...
7421
Andreas
awnd329
Jul 17, 2006 6:03 pm
... CNTs may have a strength of 30 GPA. Blaise's paper, although excellent, really has no bearing on that. If you look at the paper, you will see that for the...
7422
Herbert Murray
hcm1955
Jul 17, 2006 6:24 pm
I have copied the conclusion from Blaise's paper. I will let everyone come to thier own opinion. Blaise's conclusion follows: "In this paper I have introduced...
7423
Andreas
awnd329
Jul 18, 2006 4:02 pm
... I recommend a look at figure 4 of Blaise's paper, which shows that uniform stress (conventional) SEs can be built faster than exponential tethers at...
7424
Herbert Murray
hcm1955
Jul 20, 2006 6:44 pm
... exponential ... be ... If I am reading Figure 1 correctly, then for an exponential SE: Tether Strength Taper Ratio 60 GPa 1 to 1.1 50 GPa...
7425
Herbert Murray
hcm1955
Jul 20, 2006 7:05 pm
I am not sure if we are on the same sheet of music. The issue is not how fast a SE can be built, but IF a SE can be built using a weaker ribbon. An exponential...
7426
Andreas
awnd329
Jul 20, 2006 10:54 pm
... If we are talking IF, we need to look at the SE that can work with the lowest possible strength, and that is the uniform-stress SE. The one where climbers...
7428
Herbert Murray
hcm1955
Jul 21, 2006 3:50 pm
... I wonder if using this type of tech a nano version of climber/SE could be initially deployed? Bert...
7429
hetrevillion
Jul 22, 2006 5:50 pm
... If the 'circular' accelerator can be used and re-used for the same launch, the 'shipment capsule' could be accelerated slowly over many 'round trips' and...
7430
hetrevillion
Jul 22, 2006 5:50 pm
... The mentioned 1-2 km. size is the diameter of the aerostat. He said one mile, actually. ... --I also would like to see it. If you read the earlier posting,...
7431
Ed Minchau
spider_boris
Jul 22, 2006 11:28 pm
... You're still running into G-force limits; more accurately, centripetal acceleration limits. The rate of change of the speed of the capsule within the ...
7432
Edward Brophy
faustic
Jul 24, 2006 11:36 am
... In a circular mass driver, most of the repulsing magnets will be along the outer wall facing in and not on the floor. All that push towards the center and...
7433
hetrevillion
Jul 26, 2006 10:38 pm
... Thanks for the comments, Ed. How about this?: Lets assume we want a 3 meter diameter capsule. We make a circular accelerator with a radius of 10-20...
7434
Graham Addis
grahamaddis
Jul 26, 2006 10:54 pm
Harvey, ... If you lower the pressure in the cylinder there is not enough air in the bottom of the cylinder to hold up the air at the top against gravity....
7435
hetrevillion
Jul 27, 2006 12:08 am
... Thanks Graham, I don't see this as a 'show stopper'. I don't care if the exit port is a 10 cm. plate steel cover that is counterbalanced and hinged to be...
7436
Duncan Hilchie
merlinsarrow
Jul 30, 2006 6:46 am
What about running the linear accelerator part up the side of a mountain and taking over with balloons once it reaches the summit? Just a thought, Duncan ... ...
7437
hetrevillion
Jul 30, 2006 10:52 pm
... I have read at least one science fiction book or short story with Pike's peak as a sloping take-off ramp for rockets, so I think a mountain would be...
7441
Herbert Murray
hcm1955
Aug 3, 2006 1:15 am
For small payloads you could hang a gun or coilgun based system from an airship Gun based http://www.columbiad.ca/industrial/index.html Coil Gun Based: ...
7442
Herbert Murray
hcm1955
Aug 7, 2006 8:55 pm
For a propulsion system why not use an electrical power steam rocket? This would require a water feed, electrical lines to be build into the tether. But a...
7443
Chris Hibbert
ag_cth
Aug 9, 2006 2:32 pm
I see announcements that the space elevator challenge will be held at NASA Ames on August 4th http://www.spaceref.com/news/viewpr.html?pid=18314, and that it...
