Why “Mach” is being discussed
The most recent Hacker News stories and comments contributing to this topic's mentions.
I don't have access to any privileged information, here. My best bet is that DARPA is lighting a fire under JPL's ass to explore variable-cycle engine technology: https:/&#…
by bigyabai · Oct 4, 2026
It's boring, but "aerial hypersonic testbed" is almost certainly NASA's intention, just like they did in the 1990s: https://en.wikipedia.org/wiki/Linear_Aero…
by bigyabai · Oct 4, 2026
Up until relatively recently, the Saturn V (and the F1 engine) was the most powerful rocket ever made, even though it's almost 60 years old. Now I believe both SLS and Starship…
by jmyeet · Oct 4, 2026
> macOS was based off NextBSD, not FreeBSD. "NextBSD" was first released in 2015: * https://en.wikipedia.org/wiki/NextBSD Over a decade after macOS/Mac…
by throw0101a · Oct 3, 2026
I'm fortunate enough to have WSL so I frankly do everything in bash. I am also in control of the Intune endpoint exceptions for development machines, to make sure they are allow…
by Quothling · Oct 3, 2026
The aforementioned P-3C being an example - a Lockheed-built example, no less. There's still part of me that can't quite believe that the SR-71 wouldn't be an exception. You don'…
by ryukoposting · Oct 1, 2026
Interest
Proportion of Hacker News items mentioning "mach" over time.
Mentions
Total number of Hacker News items mentioning "mach" over time.
The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after Austrian physicist and philosopher Ernst Mach. Read more on Wikipedia