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PaperclipPerfector  9d ago (text post)   28455 thread views

Culture War Roundup for the week of March 2, 2026

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The physics has already been worked out!

This was literally my claim, which you rejected.

We do not need to go over it.

This is, in a word, stupid. Perhaps in two words, monumentally stupid. It is nothing other than a self-declaration that you intend to remain ignorant of what you speak.

a general point that using a massively more efficient power source is superior

Sure. Are there trade-offs? How much more efficient? Is there a performance metric for that? What does it look like? What does that physically mean in terms of capabilities?

I'll note here that you've already betrayed that you know nothing about what you speak of. We already have some other technologies that are "massively more efficient", but you're not talking about them. They have trade-offs, because yeah, trade-offs exist. When discussing them, we talk about standard performance metrics and how that corresponds to capabilities.

This was literally my claim, which you rejected.

No, you were making an extremely silly and irrelevant demand to know 'how much' better fusion rockets would be after another extremely silly and pedantic point of saying that cars and horses do not use the rocket equation. I was the one who said that the physics had already been worked out, in general terms. You asked this:

This is true. How much better? What are the numbers that we can plug into the rocket equation in order to compare to the other numbers that we can plug into the rocket equation? It is only then that we can really get a sense for the scale of how much better future technologies can be.

We don't have fusion, let alone fusion rockets. We have designs, many of which may be totally unworkable since we don't have fusion and don't know how heavy the reactor will be, what net energy is yielded or what kind of constraints there will be. That is precisely why asking for these specific details is dumb. I already explained this but you didn't understand it.

I don't understand your somewhat patronizing approach of asking about concept-based performance. I don't need to cite a specific fusion design to know that fusion designs can provide much more capable rocketry. That's inherent given the nature of fusion vs chemical rocketry. We already know this. There is plenty of variance between designs and some may just not end up being workable.

We do know for sure is that the basic physics of fusion power provide vastly more energy per unit of fuel. Once we develop fusion power, we will have a much better idea of how to go about this since we will know if we're using tokamaks or lighter Helion-style approaches, if magnetic nozzles are practical, how heavy the radiation shielding needs to be.

What we DO know is that most fusion systems provide much better specific impulse and exhaust velocity than chemical rockets can. Thus, in general, fusion designs are much more suitable for exploration and colonization of the outer solar system. Asking for specific details on specific systems we cannot produce or test is not smart. Those details don't exist in the real world.

This is baseline, expected knowledge for an educated layman. You claim to be an engineer or technical in some respect. You seriously need to develop reading comprehension. It is a vital skill you will need in your work, presuming you actually are an engineer and not just LARPing for internet smart guy points.

We have designs

As I wrote (and just linked to):

Stepping back and taking a very broad view, there are several steps to the research, development, and engineering of a system. Generally, one begins with physical principles. With those physical principles, one can compute theoretical limits. One can also sketch a concept of operation based on those physical principles. Often times, at that point, one can still handwave away many practical concerns and compute how close a concept could, in theory, get to the raw theoretical limits. As one progresses, one may include an increasing number of more real-world difficulties.

For nuclear rocketry, we are not building on a blank slate, as though no one has ever started down this path at all, as though we simply have no idea what the theoretical limits are or what the concept-based performance could look like (still handwaving away many practical considerations). People have been doing this work and publishing it for half a century.

Sigh.

What we DO know is that most fusion systems provide much better specific impulse and exhaust velocity than chemical rockets can.

As I just wrote, and you ignored:

I'll note here that you've already betrayed that you know nothing about what you speak of. We already have some other technologies that are "massively more efficient", but you're not talking about them. They have trade-offs, because yeah, trade-offs exist. When discussing them, we talk about standard performance metrics and how that corresponds to capabilities.

But I'm glad to hear that you've finally admitted that there are at least two useful performance metrics that we can actually talk about (specific impulse and exhaust velocity). So, uh, about how much better, in theory? (A range is perfectly fine here.) How does that compare to other existing systems? Are there tradeoffs with other performance metrics?

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