AnarchismIsCool

They have some interest in a "special mission" version, a common aerospace euphemism for militarized.

They also claim to be a potential candidate for a next gen Air Force One.

That's the game with aerospace startups though. The CEO gets everyone wrapped around a "vision" for some gonna-save-humanity green peace machine (insert obligatory disaster response mission) and then once everyone is hooked you look up one day from your cruise missile design and wonder WTF just happened...

Source: have worked for several of these kinds of startups, have seen this happen pretty much everywhere.

:)

Per ISA yes

Still no...

It's dependent on the speed of sound, which is only dependent on temperature, not specifically altitude contrary to popular belief.

Modern airplanes can exceed their cruising speed in a relative sense but older planes have a higher absolute maximum speed, as well as cruising speed.

Why is everyone trying to ackshewally this? The stat's are publicly available. Aircraft are optimized for a particular speed range and that impacts the designed cruising speed as well as Vs and VNE.

IME the curvature isn't really discernible until far higher altitudes. Most of the "curve of the earth" shots you see are because someone stuck a go-pro on a hiball and a combination of haze and fisheye effect makes the earth look round. If you use a camera without the lens distortion it just looks like a normal horizon.

No, try again. Not correct in any way.

They're not faster in any absolute sense, look at the wing sweep angle of new vs old jets or the fact that early low bypass ratio jets have a much higher exhaust velocity, the old jets are marginally faster by every metric.

Correction: while they helpfully wake you up in the middle of your redeye to tell you about a new exciting credit card offer only available to you in flight

Protester LARPers or police forensics LARPers?

Weapons evolve, defenses evolve. There are ways of trivially defeating cell phone tracking, and there are ways of trivially defeating AI cameras (850 ways specifically). Some auth dipshit will probably come up with some other way of betraying the working class and the cycle will repeat itself.

It...depends.

If you're not technical, signal is hands down the best solution.

If you have a group that's going to something and you are willing to take some extra steps, something like matrix/briar/simplex/whatever setup with a self hosted instance provides you with the knowledge that all the infrastructure is under your control and that the feds just aren't going to have the time to sit down and figure out how this shit works.

The thing this thread is wildly missing the point on is unless you off a ceo or are a prolific organizer, the feds are systematic. They pick a set of techniques and technologies that cast the widest net possible with the money they have, then spend their time trying to nail people within that venn diagram. Yes, security through obscurity is not ideal in-and-of-itself, but combined with encryption and chaos, you can get much farther than using the same stuff everyone else has been using for a decade+. If you stay near the leading edge of tech the feds are a decade behind you, they still have years of threat briefing powerpoints to sit through before they can even think about implementing a countermeasure.

You could find 1000 CVEs in briar but if only a handful of of people at a demonstration are using it, the feds are still going to be sitting there beating their heads against signal because that's what they know how to do. If they ever find a single high severity CVE in signal, it's game over for everyone.

Four rules:

If you just want to talk to a few friends, don't bother with the default public mesh config, setup your own with encryption enabled.

Don't use longfast, use a higher speed setting if possible. Longfast will go 10km+ in optimal conditions and in a city environment, won't go any further than medfast.

Don't use the default radio channel, pick another one.

MAKE SURE ALL SYSTEMS ARE CONFIGURED IDENTICALLY - meshtastic is picky about all the radio settings being the same for bits to go through. It cannot figure out that the sender is using a faster/slower bitrate than you are so you will just get nothing. Do not attempt to use them until you've verified that all systems reliably send and receive messages in an uncontested environment. It's very easy to misconfigure meshtastic but once you do, fixing it in the field is going to be very difficult.

I spend a lot of time in the RF space and Meshtastic is by far the most mature system out there for instant ad-hoc secure digital communications.

However...

The first rule of emergency communications is that if you can conceive of the need in the future, you need to practice using it now. Getting people to download the meshtastic app or figuring out a weird setting is a lot easier when you have working uncensored internet.

Reputable sources or stop spreading fud