Musk's viaduct costs, for instance, were 1/10th those of California's HSR. His premise is that he can decimate the HSR cost.
Obviously that is a comparison that is relevant for LA-SF, but potentially not for Houston-Austin. Which I acknowledged upthread. As did the "many competent engineers" in this piece.
> Musk's viaduct costs, for instance, were 1/10th those of California's HSR.
ISTR -- and I may be mistaken -- that a significant portion of the underestimation there wasn't engineering-related, but real-estate related, in that costs of acquiring the land for the footprint was low-balled or ignored.
I also seem to remember that, and I believe Musk attributed so much savings to it because there was very little right of way that needed to be worked out, he was going to put it in the median of I-80. That reduces the theoretical cost quite a bit.
I think that's the goal of the company doing this, to test the feasibility of the design in more detail. It's also why I'm inclined to give them some weight in their assessment of the costs. But not too much. If I was an investor in some of this testing, I would want to go over their cost assessments with a fine toothed comb. It does seem this is one of the biggest unknowns in the proposal, and it's also one of the things that could change the most depending on where it's implemented, making it hard to make definite statements about.
> I also seem to remember that, and I believe Musk attributed so much savings to it because there was very little right of way that needed to be worked out, he was going to put it in the median of I-80.
A casual glance at a map of where I-80 runs might suggest that that wasn't quite right.
That's right, it was I-5. For some reason I often confuse them, even though it's obvious one is north/south and one is east/west. I'm on portions of I-80 about once a month, but I-5 generally no more than once a year.
It's tough to seem to remember something about a source that is contradicted in the source itself. I think you should start by reading the link, and then opine on it.
No, it's not tough to seem to remember anything, human memory is very fallible. That's why I prefaced the statement with that bit, because I was in no way sure. That said, my memory wasn't that bad. Here's what I was slightly misremembering from the proposal:
By building it on pylons, you can almost entirely avoid the need to buy land by following alongside the mostly very straight California Interstate 5 highway, with only minor deviations when the highway makes a sharp turn. [1]
So it's I-5, not i-80, and it's beside the highway, not in the median. I'm not sure how either of those mistakes affect the point I was trying to make to the degree it's not worth addressing, so I'm unsure why you used a rhetorical tactic instead of just correcting (since you obviously knew it was incorrect) and addressing that point, but that's your prerogative.
We are talking at cross points. My, and I believe others, issue with the source you posted is that after stating that the actual central-valley land is cheap, it ignores the rights-of-way costs, which is where many believe a lot of the cost savings really are. It's hard to be definitive with the sources I've seen so far, because while they are all happy to post numbers for costs, few seem willing to break those down into what the cost is for, and since we are talking about different types of structures, it's hard to say whether the comparisons apply well.
As an example, your source states that the tube weight (for the larger plan) would be up to twice a train weight and thus would not cost less to build, and links to his own listing of train weights which are, as he states "To the best of my ability, I've tried to give dry weights, without passengers." That seems to imply that this is also without cargo. To my knowledge, most rail in the Western U.S. is built to handle cargo, and I imagine that's much heavier than commuter trains, and that could greatly affect building cost (to be clear the hyperloop could move cargo as well, but the relative dynamic weight of the cars to the static tube weight is much lower, yielding a smaller weight range). That leaves me without enough information to assess whether this is even a fair and valid comparison to make. There are other important factors as well, such as the weight of the hyperloop cars traveling through the tube that would need to be addressed if the tube weight was more favorable to train weight.
What this comes down to is that with respect to building cost, your source leaves me less that assured that it has done more that a cursory review of the information and applied possibly inaccurate numbers and assumptions. There's just too many details that are left out to know. At the same time, the original hyperloop proposal was lean on specifics as well. I guess the difference is that I don't see this situation as painting either stance as "fantastical," there's just not enough concrete information presented for me to know either way.
Pedantic, but "decimate" has the primary meaning of "reduce by a large percentage", based on the historical reference to a particular Roman practice of killing 1 in 10 of a group as a means of collective punishment; it does not generally (i.e., outside of the context of that specific historical practice) mean to reduce either by or to one tenth.
That's lovely but your post isn't really contributing. bmelton was pointing out an actual misuse* . "Decimate" can mean either large percentage or the traditional 10% drop, it does not mean 90% drop. Your post moves into pointless word argument territory.
* or perhaps a pun masquerading as misuse in a way that invites 'correction', an utterly terrifying category of pun I hadn't even considered before
> That's lovely but your post isn't really contributing.
To the extent that is true, I kind of thought I addressed that with the first word of the post.
> bmelton was pointing out an actual misuse
And I was pointing out an actual error in bmelton's description of the actual misuse (which -- see below -- is repeated in your description.)
> "Decimate" can mean either large percentage or the traditional 10% drop
No, it can't. It can mean reducing by a large percentage, or it can be reference to actually killing 10% of a group of people as a form of collective punishment. It does not mean reduce by 10% in any general sense any more than it means reduce to 10% in any general sense (though the latter is more likely to be within its general meaning than the former.)
> Your post moves into pointless word argument territory.
Well, I would say that tptacek's point was entirely clear despite the misuse, and that both bmelton and my responses were provided with accurate warnings by their submitters as being pedantic ("overly concerned with formal rules and trivial points of learning.")
While I acknowledge, and generally believe in the evolution of language, I refuse to succumb to the trend of colloquial usage coming to mean the opposite of a word's original intent.
To illustrate the point better, "literally" has now also been defined to mean "figuratively" in the common parlance, which means that, sadly, there is no appropriate word for literally that is unambiguous.
Similarly so with decimate. Its originalist intent is to reduce by one tenth, so, colloquial adoption aside, I reject any definition that resembles its polar opposite.
Clearly, the colloquial usage, as tptacek has done, is acceptable to many, but if words are intended to actually mean things, instead of just send an appropriate contextual vibe, then there should be some degree of rigidity to language that pushes back against its less meaningful and more ambiguous adoption.
If we're talking about ancient Latin then yes. If we're talking about modern English then no. As well argue that "beef" refers to the entire cow rather than just its meat.
a) the HSR is a political boondoggle that California will suffer with paying for decades even if it does get done.
b) if Musk is so confident on his ability to deliver, let private industry take the risk and put it up.
Its bad enough we have to foot the bill for political showmanship and braggarts, we don't need to be footing the bill for untested technology by private interest who profess extreme confidence, but seemingly not enough to back with their own money. If he will, more power to him. Love Space X, don't care for this idea other than the out of this world feel
Musk's viaduct costs, for instance, were 1/10th those of California's HSR. His premise is that he can decimate the HSR cost.
Obviously that is a comparison that is relevant for LA-SF, but potentially not for Houston-Austin. Which I acknowledged upthread. As did the "many competent engineers" in this piece.