[delayed]
It was not just the VCs. There were also influential people in Pentagon who saw the inefficiency of the prime defense contractors, especially after having seen what SpaceX was able to do. One of the consequences of this…
Indeed. Here is another page about the same thing: https://cwandt.com/products/pocket-fiche "This project is a collaboration with Miles Segal (Gotham Silicon), whose mission is to make microchip fabrication more broadly…
Sounds great as a slogan, but there are no details. For comparison, Intel's 1 um process (Fab 3, 80386-era) required about 4 weeks of processing time, and if pushed, the samples could be processed in as little as two…
Talking about the role of V2 in the development of rocketry in various countries is more or less relevant to the discussion of Isar, because it was a major milestone, and it did influence all rocketry worldwide, in many…
They do not like to talk about it too much in public these days, but Rocket Lab had somewhat shady beginnings. Once they moved past the semi-amateur phase, their first real project was weapons development on a DARPA…
It is uncontroversial among Dostoyevsky's scholars that his main focus is on Russian mysticism while the stories themselves are merely a setting for presenting author's theology. But that may be flying over the head of…
Marc Raibert was a student of Ivan Sutherland. Sutherland had a lot of pull at DARPA. This facilitated the unique prototyping work done at Boston Dynamics to get noticed and supported by DARPA. But as a flip side of…
Maybe it was a bit too colloquial. I am not sure if this is very important. A formal term would have been "full propellant load." The phrase "fill level" is also used in NASA documents. The question was whether during…
Correction: The first stage of New Glenn carries only about 260 tons of methane. The 1150 tons is the full propellent load, liquid oxygen and liquid methane combined. The heat from combustion of this amount would be…
The problem is that there is no standard meaning for the "full duration" in this context. Some reports say that this means "running all seven BE-4 engines at full thrust for up to 38 seconds". In flight the engines fire…
The TNT is relevant, because the atomic bomb energy output was defined in terms of TNT equivalent. Not the energy of the blast, but the total output. For Trinity this was 20 kt, or 20*4.2 TJ. This serves as a basis of…
You are talking about the energy of the blast. In my comment I was talking about the heat output. From the followup comments it seems I have not made it sufficiently clear. The energy of the detonation wave in rocket…
It is not clear what "full duration static fire" means, but if the stage was fully fueled, the fuel tank would have contained 1000 tons of methane. The heat of combustion of methane is 55 MJ/kg. TNT equivalent is…
Both SpaceX and NASA use LabView. NASA has a relatively detailed description of the engine test stands at Stannis: https://scholar.google.com/scholar?q=NASA+Data+Acquisition+S...…
Five years ago SpaceX reported that they had 30000 seconds of test firing time on the Raptor, over 567 engine starts. Since them the program accelerated dramatically. Well over one thousand engines had been produced,…
If we look at the venting from the propellant tank (around T+16:15) it looks thick white closer to the vent, becoming more transparent and blue as it expands. That's just sunlight scattering on the particles and density…
The views from Ship's engine bay looked rather ominous -- with the red glow visible in multiple places, and something venting furiously from the broken engine. It was a pleasant surprise that the ship did not explode…
There is an excellent three part documentary from Sandia National Labs: "Always/Never: The Quest for Safety, Control, and Survivability." (part 1) https://www.youtube.com/watch?v=DQEB3LJ5psk They cover both the…
Cleve Moler was one of the big names in numerical methods, and participated in creation of canonical FORTRAN libraries for solving linear equations, and matrix algorithms more generally. To teach this more conveniently…
They struggled with many things, often time the minutiae of accomplishing something conceptually rather simple. For example, making an explosive with a significantly slower detonation velocity turned out to be very…
[delayed]
It was not just the VCs. There were also influential people in Pentagon who saw the inefficiency of the prime defense contractors, especially after having seen what SpaceX was able to do. One of the consequences of this…
Indeed. Here is another page about the same thing: https://cwandt.com/products/pocket-fiche "This project is a collaboration with Miles Segal (Gotham Silicon), whose mission is to make microchip fabrication more broadly…
Sounds great as a slogan, but there are no details. For comparison, Intel's 1 um process (Fab 3, 80386-era) required about 4 weeks of processing time, and if pushed, the samples could be processed in as little as two…
[delayed]
Talking about the role of V2 in the development of rocketry in various countries is more or less relevant to the discussion of Isar, because it was a major milestone, and it did influence all rocketry worldwide, in many…
[delayed]
[delayed]
[delayed]
They do not like to talk about it too much in public these days, but Rocket Lab had somewhat shady beginnings. Once they moved past the semi-amateur phase, their first real project was weapons development on a DARPA…
It is uncontroversial among Dostoyevsky's scholars that his main focus is on Russian mysticism while the stories themselves are merely a setting for presenting author's theology. But that may be flying over the head of…
Marc Raibert was a student of Ivan Sutherland. Sutherland had a lot of pull at DARPA. This facilitated the unique prototyping work done at Boston Dynamics to get noticed and supported by DARPA. But as a flip side of…
Maybe it was a bit too colloquial. I am not sure if this is very important. A formal term would have been "full propellant load." The phrase "fill level" is also used in NASA documents. The question was whether during…
Correction: The first stage of New Glenn carries only about 260 tons of methane. The 1150 tons is the full propellent load, liquid oxygen and liquid methane combined. The heat from combustion of this amount would be…
The problem is that there is no standard meaning for the "full duration" in this context. Some reports say that this means "running all seven BE-4 engines at full thrust for up to 38 seconds". In flight the engines fire…
The TNT is relevant, because the atomic bomb energy output was defined in terms of TNT equivalent. Not the energy of the blast, but the total output. For Trinity this was 20 kt, or 20*4.2 TJ. This serves as a basis of…
You are talking about the energy of the blast. In my comment I was talking about the heat output. From the followup comments it seems I have not made it sufficiently clear. The energy of the detonation wave in rocket…
It is not clear what "full duration static fire" means, but if the stage was fully fueled, the fuel tank would have contained 1000 tons of methane. The heat of combustion of methane is 55 MJ/kg. TNT equivalent is…
Both SpaceX and NASA use LabView. NASA has a relatively detailed description of the engine test stands at Stannis: https://scholar.google.com/scholar?q=NASA+Data+Acquisition+S...…
Five years ago SpaceX reported that they had 30000 seconds of test firing time on the Raptor, over 567 engine starts. Since them the program accelerated dramatically. Well over one thousand engines had been produced,…
If we look at the venting from the propellant tank (around T+16:15) it looks thick white closer to the vent, becoming more transparent and blue as it expands. That's just sunlight scattering on the particles and density…
The views from Ship's engine bay looked rather ominous -- with the red glow visible in multiple places, and something venting furiously from the broken engine. It was a pleasant surprise that the ship did not explode…
There is an excellent three part documentary from Sandia National Labs: "Always/Never: The Quest for Safety, Control, and Survivability." (part 1) https://www.youtube.com/watch?v=DQEB3LJ5psk They cover both the…
Cleve Moler was one of the big names in numerical methods, and participated in creation of canonical FORTRAN libraries for solving linear equations, and matrix algorithms more generally. To teach this more conveniently…
They struggled with many things, often time the minutiae of accomplishing something conceptually rather simple. For example, making an explosive with a significantly slower detonation velocity turned out to be very…