Halls of Shrewd'm / US Policy❤
No. of Recommendations: 2
This is pretty cool but this Government expenditure seems at odds with Biden's war on Fossil Fuel. The carbon footprint per passenger mile of this thing has to be enormous but for some reason the article ironically concludes with,
"It's important to innovate responsibly so we return benefits to travelers and do no harm to the environment.' ... Mary Jo Long-Davis, manager of NASA's Hypersonic Technology ProjectHere is the article...
https://luxurylaunches.com/travel/nasa-supersonic-...NASA is developing a supersonic passenger aircraft that will reportedly have a top speed of Mach 4 (~3000mph), which will not make it twice as fast as the Concorde but also faster than the legendary SR-71 Blackbird spy plane that was designed with a top speed of Mach 3.2 (around 2500mph). NASA claims that the proposed supersonic jet will cut down the travel time from New York to London to under one and a half hours. Typically, flights to New York take around eight to nine hours as the current crop of large passenger jets cruise at around 600mph. For comparison, the iconic Concorde that retired two decades ago could maintain Mach 2 (1,348 mph).
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... more at the link
No. of Recommendations: 3
No. of Recommendations: 3
I would have to dig more deeply into it. But I am familiar with the SR-71, and it's major problems weren't with the size of the sonic boom. The principal problem is heat from friction. That causes the fuselage plates to expand. They solved that at Skunk Works by making the plates loose-fitting, but then the craft leaked fuel like a sieve. But at supersonic speeds, the plates expanded and it sealed right up.
It will be interesting if they have solved that problem in a way that doesn't require refueling immediately after take-off.
No. of Recommendations: 1
You gave us a dead link. But just curious: why is this an "in your face" for John Kerry? - CO
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Sorry about the dead link.
In your face is rooted in observing the schizophrenic irony of the US Government investing heavily in a massive carbon producing supersonic passenger jet AND at the same time investing heavily to reduce planet destroying CO2, the primary ambassador of which is John Kerry.
No. of Recommendations: 0
I would have to dig more deeply into it. But I am familiar with the SR-71, and it's major problems weren't with the size of the sonic boom. The principal problem is heat from friction. That causes the fuselage plates to expand. They solved that at Skunk Works by making the plates loose-fitting, but then the craft leaked fuel like a sieve. But at supersonic speeds, the plates expanded and it sealed right up.
It will be interesting if they have solved that problem in a way that doesn't require refueling immediately after take-off. - 1pg----------------------
Thanks 1pg, that is interesting about the SR-71. I have never heard about that problem before.
Here is another article on traveling at supersonic speeds that I found quite interesting and you may too.
https://a-z-animals.com/blog/how-fast-is-mach-9/Faster than the speed of sound, Mach 9 travel is similar to a spacecraft returning to Earth through the atmosphere. It's fast, it's hot, and it's fascinating to learn more about how quickly humans can will their inventions to travel.
Discover more about Mach 9: how fast it is, if humans can travel at that speed, and which aircraft, if any, can travel at that speed.
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... more at link (if it works)
No. of Recommendations: 3
bighairymike: In your face is rooted in observing the schizophrenic irony of the US Government investing heavily in a massive carbon producing supersonic passenger jet AND at the same time investing heavily to reduce planet destroying CO2, the primary ambassador of which is John Kerry.
Ah, I see.
Well, I guess you missed this, then:
'The design concepts and technology roadmaps are really important to have in our hands when the companies are finished,' said Mary Jo Long-Davis, manager of NASA's Hypersonic Technology Project. 'We are also collectively conscious of the need to account for safety, efficiency, economic, and societal considerations. It's important to innovate responsibly so we return benefits to travelers and do no harm to the environment.'
No. of Recommendations: 0
Well, I guess you missed this, then:
'The design concepts and technology roadmaps are really important to have in our hands when the companies are finished,' said Mary Jo Long-Davis, manager of NASA's Hypersonic Technology Project. 'We are also collectively conscious of the need to account for safety, efficiency, economic, and societal considerations. It's important to innovate responsibly so we return benefits to travelers and do no harm to the environment.' - CO
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No I didn't miss it. Apparently you missed that that very statement was part of my OP and is basically part of what I was mocking. Flying 4x the speed of sound carrying very few passengers is going to an produce an enormous increase in CO2 per passenger mile. Her statement was likely just standard boilerplate when defending large expenditures of taxpayer dollars. I am surprised she didn't mention how 4x supersonic flight will somehow restore equity to the international jet set community.
No. of Recommendations: 2
It will be interesting if they have solved that problem in a way that doesn't require refueling immediately after take-off. - 1pg
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Thanks 1pg, that is interesting about the SR-71. I have never heard about that problem before. BHM
I always considered that a materials problem. We've gone from not understanding all the properties of materials, to being able to predict the properties of several different materials combined, and innovating so we can dial in the cost of materials and predict the cheapest way to get the desired properties. Fascinating. I've read about the leakage problem in the SR 71, and I would say if they designed it now that they could have no leakage in a short period of time.
