[delayed]
Sam Zeloof's new company is a serious business. It is actually a great example which shows the difference between cobbling something in a garage, to produce a one-off demonstration, and having a mini-fab which is…
The history of precision machinery is a steady ladder of using old machines to produce new more accurate components, and then new more accurate machines. But simply making something smaller is not synonymous with it…
Cold gas thrusters used in space applications typically produce 60-70 kgf of thrust for 1 kg/s of gas flow, which means the average axial velocity of the jet is just under 600-700 m/s. It is a little more when the gas…
The cable contains not only the fibers, but also optical amplifiers to compensate for the losses. Even for 24 fibers, the amplifier is a substantial and expensive piece of equipment. It also requires electric power,…
A very good 10 MHz ovenized crystal oscillator, Hewlett Packard 10811D, ages by up to a few Hertz per year, and has a mechanical capacitor for trimming the frequency by up to 10 Hz, and an electronic frequency…
There are different types of atomic clocks, but in most common types, the output comes from a crystal oscillator, or more generally frequency synthesizer, which is then slaved to some spectral feature in the "physics…
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…
[delayed]
Sam Zeloof's new company is a serious business. It is actually a great example which shows the difference between cobbling something in a garage, to produce a one-off demonstration, and having a mini-fab which is…
The history of precision machinery is a steady ladder of using old machines to produce new more accurate components, and then new more accurate machines. But simply making something smaller is not synonymous with it…
[delayed]
[delayed]
Cold gas thrusters used in space applications typically produce 60-70 kgf of thrust for 1 kg/s of gas flow, which means the average axial velocity of the jet is just under 600-700 m/s. It is a little more when the gas…
[delayed]
The cable contains not only the fibers, but also optical amplifiers to compensate for the losses. Even for 24 fibers, the amplifier is a substantial and expensive piece of equipment. It also requires electric power,…
[delayed]
A very good 10 MHz ovenized crystal oscillator, Hewlett Packard 10811D, ages by up to a few Hertz per year, and has a mechanical capacitor for trimming the frequency by up to 10 Hz, and an electronic frequency…
There are different types of atomic clocks, but in most common types, the output comes from a crystal oscillator, or more generally frequency synthesizer, which is then slaved to some spectral feature in the "physics…
[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…