The US nuclear engine program is very similar to OTL Project Rover which has delivered a functional small rocket engine that can be flown, however, the politics around it along with the limited military applications of a nuclear engine are almost certain to keep it from flying on any rocket. Without a Nixon EPA or a large incident happening they'll likely push the Pewee engine to full-scale testing unlike OTL, but well, it's almost certain to never fly on anything unless the Cold War goes far wilder.
Huh. So their program is going fine, but they've given up on operations beyond Earth Orbit or are happy enough being obviously second best. Well, the Solar System belonging to Communism will be a strong propaganda card.
And if there's no EPA, is there less pressure for the US to clean up its environment (like has the Cuyahoga River not caught fire as often or something) or has the US been implementing a patchwork of small measures that are spread across several agencies?
Yeah I have to say I'm leaning towards this as well, I was never really as focused on the "rocke" part of NTRs as the "nuclear" part. With us going heavier on the unmanned probes we can still get a lot of work done with just letting them coast for a while or just very long duration ion engine burns since we don't have to worry about keeping any crew alive.
If we somehow manage to get, we'll, any kind of NTR actually flying on a rocket we'll have done better than than real life. I'm much more interested in that this starts making us look at some of the fundamental issues like "how do we keep a reactor safely critical in a 0g vacuum?" since I feel like just nuclear power in space can open up a lot in general. So I don't have much reason to pour even more funding into rockets.
High power generators and reactors in space turn out to be really hard, such machines need moving parts and circulating fluids, or super exotic engineering, and you need to carry around a bunch of radiators to dump the waste heat. No convenient air or water around the ship to offload the heat into. All space born reactors and generators that I am aware of have had a thermal output of under a megawatt.
As you say, there are enormous rewards for cracking the problem. Alot of really fun stuff (not just ion engines) becomes practical once you have that sort of power supply in space. But I don't think that nuclear engines particularly moves us closer to such things. Maybe one of the monatomic hydrogen engines being proposed could have such spin-off applications? A reactor with a hydrogen plasma exhaust could power a MHD generator.
There's alot of practical engineering to do to get to a working liquid core or ultra-hot ceramic core reactor and then to a generator that could run off of it and then get them both to work reliably in space.
I am much more interested in designs where we could use the spent rocket reactor core as the fuel for an RTG since the weight savings of making your spent engine fuel also be the fuel for your electrical generator could be quite nice.
But so long as one of the lower cost and more practical designs gets funded, I don't think it would hurt the space program to also fund a more ambitious program. But as Crazycryodude says, a more ambitious second track program would be 50% more funding for the nuclear engines. Is something this blue-sky really something we need to spend money on right now?
If we did go for an ambitious second program primarily for spin off benefits, I have more warm feelings towards the Low Pressure Designs. A high temperature ceramic core test article would push forward our ceramic technology, which may have applications for improving the linear core or expanded surface area designs and it might eventually lead to something that could power a MHD generator. On the other hand, the liquid core option also has alot of spin-off promise, and if the problem of starting it in space is solved, would be a much more sure path to a reactor for a MHD generator. If I didn't care about getting a working nuclear rocket out of the program, I would be hard-pressed to choose between these two. In general, I would expect that the low pressure design would be better for space program spin-offs and the liquid core design would be better for Earth-bound spin-offs.
But who knows what we will end up rolling?
EDIT: Or maybe a more conservative reactor could be more useful than I had first assumed - there's some ideas for how to use them to power generators like
this.
The 5 RpT that would be required to fund a more ambitious engine design would see far more use on funding Mercury probes, Martian sample return, or inflatable experiments IMO.
Yup, I agree.
Look comrade we solved Oxygen-Rich Preburners there is no ceramic fortress Soviet rocket science cannot storm >
More seriously, I knew about how monoatomic Hydrogen was a molecular wrecking ball worse than any conventional substance. Given we rolled decently on the project roll I assumed my concerns were overblown and our engineers (as well as the researchers doing work on this later OTL) did not all collectively forget to consider this extremely severe problem on a trap option.
I was thinking about this overnight - it is possible that the engine would be more practical than I was assuming due to the low operating pressure.
But that still leaves the questions over whether this design can even sustain a chain reaction and the problem that we just don't need such performance.
So calling it a trap is probably unfair, but I still don't know why we'd try to build this right now.
But anyways, thank you for the rundown of our situation. Given that the weaker rockets will be sufficient for any mission we'll realistically propose in the seventies or eighties I am comfortably going with the two simple designs. If we still have space ambitions when the new millennium approaches we can propose a more ambitious design then.
If we do go for more ambitious designs later, the experience of operating more conservative designs for many years will come in handy. Indeed, there's plenty of times when an incremental approach actually is the faster route to higher technology, see how TSMC overtook Intel in using EUV in their fabs.
(There are plenty of counter-examples tho. Sometimes a little ambition is the way to get better, faster.)
Uh, no, losing Austria is one hundred percent not acceptable to anyone in power. If it looks like we might actually lose it, we'll intervene as hard as necessary and put down whoever resists. Now, I don't think it's all that likely to happen, but if it does, we - as in Klim - end up looking kind of bad and hardliners get noticeably empowered. In contrast, the odds of MFA's option backfiring, especially so hard it causes a nuclear war, are significantly smaller, and its positive outcome wouldn't forever sour Austrian opinion of USSR. I think significantly smaller risk of a worse outcome is worth it, in this case.
There is a case for
Protect Socialism here. But when dealing with unrest, history shows that either a decisive crack-down is required, or a laid back approach works best. The middle path (like the MFA proposal) is too soft to control things if they get bad and hard enough to piss people off.
For me, I am looking at how badly the Afghan, Hungarian and Czechoslovak interventions went for the OTL USSR. Going in hard put the lid on small unrest, but at the cost of seriously weakening the global position of the USSR.
Also, what do you mean by "losing Austria"? If you mean Austria allying with France or the US, yeah, we'd have a war. An actual counter-revolution would be an issue too. But that's not what anyone is calling for in Austria. There are protestors who want to be neutral. There are protestors who feel the current regime is too authoritarian - that's different from being actually counter-revolutionaries. And honestly, a neutral Austria would help our security situation. That's why the Soviets let Austria be neutral in OTL. I think the regime could cope with Austria becoming a neutral Socialist state like Yugoslavia.
Notably, not only Able Archer didn't go hot, the situation was very different. A large scale exercise after a period of rising tension with a lot of intercepted chatter between participants and no clear cause could, in theory, be a preparation for nuclear first strike, but a large scale exercise when you're suppressing the unrest in one of your subjects is a clear "Look how tough we are, don't fuck with us" defensive message. Yes, if French wind themselves up overmuch, and false alarm happens, and they react badly because of it, a nuclear war could happen. The odds of all of that happening are miniscule.
You are assuming that the French share the politburo's view of how serious the situation in Austria is. We can't control what information the French get or how they interpret it.
And keep in mind, we've been majorly heating up the Cold War in Africa, which especially targets France. This isn't a good time for tensions in Europe itself.
Regards,
fasquardon