Slashdot Mirror
NASA Redesigning The Space Shuttle
ekarjala writes "To avoid wing damage from foam separation in the future, NASA is planning a redesign of the existing shuttle. Seems to me it is time to consider a new design rather than a redesign -- let's take the lessons we've learned and create a space craft for the 21st century rather than re-treading a 30-year-old design."
There is no magical autocad plugin that just redesigns the shuttle system. Just because we all want to see some sort of B5 or Star Trek design hurtling up into space, holodeck and all, doesn't make it worth while to scrap an entire group of shuttles, their support systems and the related industries behind it.
In any case, if you want to do something about the sad state of the space program, push for giving the private sector the ability to do what NASA does. There is where your real innovation will take place.
Efficiency - the shuttle was designed to be readily reusable and cheaper than throw-away rockets. It has not proven such. Safety - Things _are_ pretty safe, but not safe enough. Newer tech is significantly better. Smaller is safer, and easier to deal with: why the dual-use of sending people and stuff together? Send up 'stuff and supplies' in unmanned ships, send up 'people' in transports, and don't do both at the same time. Numbers - There are no longer enough shuttles to sustain an op-tempo that can help get real science done. Cheaper is better. And unmanned is cheaper and less risky. 4 unmanned launches to every manned launch should be a goal. What we need is more space _exploitation_, not exploration: we need to get a manufacturing capability out of the gravity well, using ambient energy. For instance, some very finely tuned instruments are best constructed in space. Eventually, we need to exploit other resources, further away from us. _THEN_, and only then, we can go to Mars.
Also John Glenn has several times stated that the science is important and that the ISS needs to got to full staffing of 6 or 7 ASAP. The re-entry sphere would allow that to happen rapidly and is likely why he supports that idea.
Disclaimer : I do live in the Huntsville area, but I am not in anyway affliated with Marshall SFC or NASA.
I have no sig, does anyone have one to spare?
I'm sure many will disagree, but the cost of the shuttle program is horrendous, and NASA's insistence on using it has led to some cataclysmically stupid decisions. One example: the ISS (which is an utter joke compared to Skylab or Mir) was placed into a rapidly-decaying orbit not because that was a good idea (it isn't) but because the shuttle could get there.
Most of the satellites that are "launched" by the shuttle suffer from the design constraint that they have to fit into the friggin' bay AND have room for the accompanying boosters that will put them into their real orbit once the shuttle lets them out. Again, the shuttle can't go high enough for real deployment.
The idea of capturing and reparing satellites is inherently absurd; most aren't where the shuttle can get 'em and the total cost of the program utterly dwarfs the expense that would have been incurred had they said of the Hubble "Well, we screwed it up...build another one and get it right this time."
The safety record sucks. After Challenger Richard Feynman put the probability of a fatal accident at one in fifty. So far, NASA's on the money and the nature of the shuttle is such that if someone dies, everybody dies.
Lest I be misunderstood, I understand the romantic and scientific appeal of manned space flight, of the visceral sense of satisfaction we can have as a species when we look up to the skies and say "We live there." I'm a strong proponent of that. I also recognize the complaints that the money spent on that is money not spent on (feeding the hungry, housing the homeless, inoculating the sick, fill in your pet cause). The manned space program is hellishly uneconomical and a great deal of that can be laid at the feet of the shuttle program.
It's a white elephant without a mission, a bastard child of a spacecraft and an airplane which like most gadgets that try to do two fundamentally different things does neither well. Its payload capacity compared to heavy-lift rockets is a joke, it's barely capable of crawling out of the atmosphere, it's presented a tremendous constraint to the rest of the space program by forcing many missions to be less than they could have been in order to be shuttle-doable, and it bears repeating that every fifty flights it kills everyone on board.
It's time to ground the shuttle fleet permanently. Space isn't going anywhere. Stop pouring the hundreds of millions of dollars into the shuttle program and pour them into a new design effort. Scrap the silly "space-plane" concept and develop a family of lifters and craft that _can_ be used for many things but don't back NASA into a corner that forces them to use it for all missions. Make crew safety an inherent feature (recognizing that there are tradeoffs and that getting out of the gravity well is a fundamentally dangerous activity). Stop throwing good money after bad on that ISS as well, and use the collective resources of the two programs to start over. It's not true that the second design is always better than the first (see again ISS and Mir/Skylab) but you're wise to play those odds.
Let's do it over. And do it right.
The following promises were made to us in the early days of the Shuttle: all these promises have failed to materialize.
It's more of a space Chevy pickup. When I think of trucks, I think of semis--things capable of carrying huge loads over long distances. The Saturn V rocket, the reliable workhorse of the Apollo program, could launch over 250,000 pounds to low Earth orbit or even put men on the moon. The Shuttle, by comparison, can only put 58,000 pounds into low Earth orbit and cannot reach higher orbits. Saturn V rockets made the 250,000-mile trip to the moon not once but several times, while the highest the Shuttle has ever gone is a meager 385 miles (335 nautical miles) during STS-82.
In fact, the Shuttle is so sharply limited that it rarely deploys a satellite directly. Instead, the satellite is mounted to yet another rocket, carried to low orbit in the Shuttle cargo bay, and the second rocket then kicks it into proper orbit. I don't understand the logic: we launch the Shuttle into orbit so we can have astronauts risk life and limb
Endeavour cost $2.1 billion (source) and each launch costs $450 million (source) per mission. Most of that expense is taken up in refurbishing the Shuttle afterwards, where so much of the Shuttle is disassembled, inspected, replaced and reassembled that it's fair to declare it ``rebuilding'' instead of ``refurbishing''.
More than this, not one single flight component of the Shuttle--not one!--has met its original flight rating. For example, the Shuttle's main engines were originally rated for 27,000 seconds of thrust (about 55 flights). After that time, the engines would have to be replaced. This design goal has not been met. As Nobel Laureate Richard Feynman wrote in the official report on the Challenger disaster, ``[t]he engine now requires very frequent maintenance and replacement of important parts, such as turbopumps, bearings, sheet metal housings, etc.
Between maintenance, rebuilding and inspections, it's not uncommon for a given shuttle to only go up once a year. In Columbia's case, its final mission was its twenty--eighth flight in twenty--two years of service, and its second since 1999. We are nowhere near 26 launches per year per Shuttle; we aren't even close.
Hardly. Each launch costs $450 million. Even if the fleet were capable of 26 launches per shuttle per year, there's no way we could afford it. Instead of costing one hundred dollars to put a pound into orbit (as we were promised by NASA in the 1970s), it costs $7,750 ($450 million per flight, divided by 58,000 pounds of cargo). A 7,650%-cost overrun per flight can be read one and only one way: an engineering failure.
By comparison, the Saturn V rocket could put a pound into orbit for $3,500, and a Russian Proton-M for $2,062.
If the official NASA line of $450 million per flight isn't mind--boggling enough
The first shuttles cost $1.7 billion. Endeavour cost $2.1 billion
Many of the kinks and problems have been ironed out.
Evidence indicates that several kinks and problems remain.
Think of it in terms of software, which do you think works better: version 1.0 or version 9?
In terms of software, we're on space shuttle version 1.99.99.99. We have tremendously smothed the wrinkles in an existing design, but the specifications at creation and the current necessary specifications and available technologies are radically different. This is not as simple as saving space and weight by using LCD moniters instead of CRT's... Could shuttle subsystems communicate more efficiently over 802.11b? Should liquid, nuclear, or ElectroMagnetic accelerants be used in place of solid fuel boosters? Should the shuttle carry less weight in order to carry payload to a higher orbit? Escape pod?
For crying out loud NASA engineers still scour Ebay looking for parts to keep the shuttle fleet up in the air. Isn't it about time we put a PowerPC or a P4 up in the air?
Maturity of a technology involves both incremental and radical redesigns... Such a process brought Win95, NT, XP, and someday a mature Windows OS. Mac OS9 was a very mature OS (based off of an OS7 lineage), but it was just too old and, in some ways, too mature to jerry rig preemptive multitasking into it.
Now that the shuttle has followed its natural lifecycle we are in the enviable position of looking at its role in the larger world and saying what is it being used for and, using our experience, how can we better design it to serve that need?
I am not saying a new design is a bad idea, just that we have a significant investment in our current shuttle and thats why it has been around so long.
Sadly, pouring good money after bad isn't going to help our prospects long-term. The costs are sunk, and can't be recouped. If designing and implementing a new shuttle costs 50 billion dollars, but the per-launch costs can be reduced from 450 million to 100 million, then assuming an acellerated launch schedule of one flight every two weeks (the original estimates for the original shuttle), we will have a net financial gain after less than 5 years. And besides the financial gain, who knows what the value of the scientific gain by having a shuttle capable of such frequent voyages.
(Yes the above numbers are somewhat spurious, but they also don't take into account the 2-4 billion dollars per current shuttle with a 50 flight lifespan, the cost of investigation of a shuttle disaster, the potential for reduced personnel in a more modern system, etc)
The ______ Agenda
build a wind tunnel to simulate a 12,500 MPH wind and simulate the atmosphere at 207,000 feet for an object as big as the orbiter, but it will be very expensive and difficult to build in our political climate.
:)
However it would be cheap and easy to build in a different political climate. Of course it would have to be a political climate that runs on soy-based biodegradeable pixie dust.
-
- - You can't take something off the Internet! That's like trying to take pee out of a swimming pool.