Quote from: deadman1204 on 10/18/2023 02:34 pmNASA has offloaded alot of risk and some of the cost onto the companies involved. I'm going to argue with that statement, or at least question it. What does "offloaded a lot of risk... onto the companies involved" mean? There are different kinds of risk, but right now, at the most basic level, these are mostly NASA-funded missions serving NASA requirements. Therefore, if they fail, NASA loses. It loses money, and it loses that capability to land whatever it wanted to land. So the risk is still NASA's risk.Now we can also say that if a mission fails, the company that built it could possibly go out of business, or at least suffer loss of stock value, reputation, money. So the company also has risk. But I think that is more the function of the size of these companies than NASA offloading risk onto them. Take an alternative situation where NASA contracted Lockheed Martin to build a lander and it fails. LM is so big that the company is not going to take much of a hit.
NASA has offloaded alot of risk and some of the cost onto the companies involved.
I don't think we disagree. I'm not a fan of CLPS. Using small, inexperienced, resource constrained companies increases the risks of failure... NASA is insulated against cost overruns, unless they bankrupt the contractor, in which case NASA loses the whole mission. That happened with Masten.
They will be seen as NASA missions so failures will do some reputational damage to NASA
and science payloads that NASA funded will be lost.
The lander on this mission, NOVA-C, is methalox. So not only do they have to land on the moon, they also have to manage boil-off issues. Somebody may correct me on this, but I think it will be the longest duration flight of any cryogenic rocket stage.
I don't see a commercial market for these landers. I think they will be dependent on NASA funding for a long time. If the landers perform well, then maybe the companies can win other NASA and Pentagon contracts.
That is true. The way the contracts are written could limit NASA's risk if the company fails to deliver. But just about every contract, including a cost-plus contract, is also going to have performance-based awards. Look at it like this: suppose NASA signs a contract with Lockheed-Martin that is cost-plus, but it reaches orbit and then fails. Although NASA paid the money to build it (and any overruns that occurred), NASA will not pay any award fees they would have had to pay for successful operations. Not exactly potato/potahto when comparing it to a services-based contract, but not completely different either.
That said, I've heard that NASA has been providing a lot of under the table support to these projects to reduce the risk of them failing. For instance, having experienced NASA personnel help the contractor's inexperienced personnel. So although a services-based contract is supposed to put more risk burden on the contractor, NASA may have recognized that letting the contractor fail is not a good option.
The reality here is that NASA provides a lot of support to contractors of all types and sizes on NASA missions because contractors can’t afford the carrying costs of all the domain expertise that NASA maintains. You’re not going to find, say, lunar terrain and regolith experts in most aerospace firms. NASA has to provide that expertise. LockMart couldn’t pull off Mars landers without specialized JPL expertise, and JPL has found out that it can’t do an MSR lander without LockMart’s (or some other firm’s) engineering experience and cost structure. It’s why every Explorer, Discovery, and New Frontiers proposal is a partnership between a government lab and an aerospace contractor, with a (usually university) PI riding herd on science prioritization and instrument teams.
But this part above is missing my point--what I have heard (maybe it is not accurate?) is that NASA has provided this additional mission/engineering support after it became apparent that the companies lacked capabilities...
what I have heard (maybe it is not accurate?) is that NASA has provided this additional mission/engineering support after it became apparent that the companies lacked capabilities, and that the risk of failure was higher than originally expected or desired. That's a different thing than the standard practice of teaming up NASA civil servant expertise with contractors. That's not what they did with CLPS. And that was the context of my original post about risk--CLPS was set up to accept more risk of failure (as Zurbuchen said, taking multiple shots on goal), and then the agency realized that they had a problem and they needed to fix it. It is good that they're trying to fix it, but it raises the question about the original decisions made when CLPS was set up.And at the risk of ranting here, one of my issues with CLPS is that we have a lot of experience with planetary programs and we know how to do these things right, and we also know what happens if we fail...It's one thing to accept a "higher risk posture," it's another thing to ignore decades of experience about what works and what does not work.
What happens is that failures of planetary programs attract a lot more political scrutiny than failures of other programs unless they are very expensive. The lesson was the late 1990s failures of two Mars missions, which resulted in NASA getting a lot of public and political criticism.
So jump to today and ask what will happen if NASA crashes two lunar landers into the Moon after we have seen multiple successful ambitious Chinese landers, and a successful Indian lander? It will result in a lot of scrutiny, and maybe a review board, and then we may experience deja vu all over again.
NASA stored LCH4 on orbit with zero boiloff for four months on CRS-16. See Robotic Refueling Mission 3. LCH4 with boiloff for days is comparatively straightforward.Centaurs have demonstrated LOX (and LH2) storage and firings after ~10 hours with about 2% loss. There are several types of diesel submarine that rely on multi-week storage of liquid oxygen for underwater operation and propulsion. One can buy LOX dewars online. The devil is always in the details, but multi-day storage of LOX is hardly witchcraft.
What matters, IMO, is that planetary science finally has something akin to the Explorers Program, where future PIs can get flight experience, where new instruments can be proven out, and where novel technologies and approaches can be tried in a low-cost, risk-taking, Category 3 environment against a nearby target.
Quote from: VSECOTSPE on 10/25/2023 02:13 amNASA stored LCH4 on orbit with zero boiloff for four months on CRS-16. See Robotic Refueling Mission 3. LCH4 with boiloff for days is comparatively straightforward.Centaurs have demonstrated LOX (and LH2) storage and firings after ~10 hours with about 2% loss. There are several types of diesel submarine that rely on multi-week storage of liquid oxygen for underwater operation and propulsion. One can buy LOX dewars online. The devil is always in the details, but multi-day storage of LOX is hardly witchcraft.I didn't know that liquid methane storage on orbit had been demonstrated. However on CRS-16, they had a cryocooler to keep the methane liquid, and they stored the methane in a dewar tank that was probably heavy and very well insulated. All that requires mass and power. A rocket stage needs the lightest possible tank, but it will have to be well enough insulated to keep boil-off to an acceptable level. It is one more thing that can go wrong. On CRS-16 the cryocooler failed early, and the tank had to be vented.