Comments on: Why the Space Shuttle, aka the "Flying Brickyard," Deserves to be Retired

By: acuvue oasys rebate

acuvue oasys rebate — Tue, 26 Jul 2011 22:41:57 +0000

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By: Frank Glover

Frank Glover — Sat, 09 Jul 2011 17:49:14 +0000

“What is holding up the deployment of a space elevator, anchored by an orbiting dock, capable of lifting payloads into orbit and costing a fraction of a heavy launch vehicle? And championed by the likes of Arthur C. Clarke…”

Oh, nothing but the inability to make many kilotons of the nanotube material required, *and* geting it to Geostationary orbit, from which construction must begin…

Also, space elevators are of use only for *reaching* geostationary orbit, and not everyone wants or needs to go that high. Step off at LEO (let’s say 200 miles), and you *still* have to develop a lot of horizontal velocity in a hurry.

And, how fast can you clime this thing? Going to GEO means a slow ride through the VanAllen belts. Rockets doing a high-thrust burn to GEO (or beyond) cut across them in a short time…

By: Taikonought

Taikonought — Sat, 09 Jul 2011 09:23:55 +0000

@Paul
I’m sure the Shuttle program has got some tech that the Chinese space program could use. Would save them time and money re-inventing the wheel (provided of course they haven’t already downloaded all the data from NASA )
I remember watching their first space ‘walk’. The poor guy was trailing all manner of tubes that it reminded me of an octopus squeezing out of a bottle!

At the very least I think access hatches should be standardized for all spacecraft regardless of nationality. Out there, its either you are an earthing or you are an alien. And in a tight spot, I laying my bet that help will be coming from an earthling.

By: LeapinLes

LeapinLes — Sat, 09 Jul 2011 05:14:54 +0000

Is there a pandemic of ignorance going around?
The Shuttle program didn’t “fail”. It was neutered, bound, and cutoff
at the knees, and that was just at the beginning.
It’s like saying that a thoroughbred trainer failed when all he was
given to work with is plow horses.

By: Al Cibiades

Al Cibiades — Fri, 08 Jul 2011 16:21:26 +0000

>>Paul -
20/20 hindsight is a waste of time & air — Unless you can implement positive changes.

Bottom-line: HST, ISS, Chandra, CGRO, and the general Space Excitement *WERE* launched through the shuttle program; to belittle their value by replacing the launch mechanism is also foolish.

Like that great philosopher whats-his-name said: You work with what you’ve got; not with what you wish you had.

In fine, if we had a way to remove incompetent and self-aggrandizing politicians from the matrix of science, industry and politics, I would suggest we actuate it *real* soon…

By: Paul

Paul — Fri, 08 Jul 2011 15:24:29 +0000

Spiridonia: none of those satellites would have required the shuttle.

The HST, which made the most use of the shuttle’s capabilities, cannot save the shuttle program from condemnation. If there had been no shuttle, but we had really wanted a space telescope, then HST-like satellites could have been orbited by expendable rockets. We could not have repaired them in space, but the cost of manufacturing a series of them (amortizing the engnineering cost over several satellites) would have been less than the cost of the shuttle repair missions.

Chandra and CGRO were launched on the shuttle, but there is no reason they couldn’t have been launched on expendables. And the fourth “great observatory”, the Spitzer IR telescope, was shifted to an expendable launcher.

One could argue that, absent a shuttle, these satellites would not have been funded. But that would say something about their preceived value, wouldn’t it?

Taikonought: what makes you think they’d want to buy it? If China wants to get anything from us, it’s SpaceX’s aggressively lean booster making capability.

By: Taikonought

Taikonought — Fri, 08 Jul 2011 08:51:52 +0000

Just a thought. How about selling the Shuttle lock stock and barrel to the Chinese government? They have the money and currently appear to be the most motivated nation with regards to space programs. Not to say of saving the jobs of those guys and gals working on the program. Expertise with hands on experience like that going into retirement is just such a waste.

By: spiridonia

spiridonia — Fri, 08 Jul 2011 06:54:40 +0000

Hey Paul. So you’re say that placing the Hubble telescope in ordit was a “programmatic disaster,” the Chandra x-ray telescope was a “programmatic disaster,” building an International Space Station was a “programmatic disaster.” Is that what you are saying? Ok, so it didn’t “reduce the cost of reaching orbit,” but look at what we’ve gained and what we learned by having the Shuttle.

By: Paul

Paul — Thu, 07 Jul 2011 18:58:39 +0000

Chas: lack of material that is strong enough on the scales required, and the concern that orbital debris would sever the elevator even if it could be built.

More generally, the demand for transport into space is currently too small to justify building such an object. This is generic problem with many proposed launch systems (and it was a problem with the shuttle).

Realize also that an elevator capsule on a space elevator still needs rockets (with about 5km/s worth of delta-V), so that the passengers could survive if the capsule falls off of the cable breaks. There is a range of altitudes over which a unpowered capsule would reenter the atmiosphere too fast and too steeply for the passengers to survive the deceleration.

By: Brian

Brian — Thu, 07 Jul 2011 18:31:14 +0000

Wouldn’t the ozone destroy any cables, etc that are used to connect the orbiting dock with the launchpad?