What more can i write about moving stomach walls?

You've gotta be kidding me? There's plenty that can rev higher. Motorcycles?? Even modded engines can rev to 14k+

I am the only one left

Hmmm, fair point. There are some very high performance gas piston motors that can do 9-9500, but unless they were looking st a Ferrari or a Shelby Mustang than you're right

Doubtful. Never seen a "regular" piston engine that comes anywhere near 10k revs.

I'd disagree that most airline flights still have 2-pin audio jacks, as most aircraft have seats that have been upgraded to 1-pin stereo audio jacks. The 2-pin audio jacks were an upgrade from the two-hole jacks passengers attached sound tube headphones into.

https://apex.aero/articles/sound-tube-surprising-history-airline-headsets/

So your saying they haven't revisited entertainment systems since the 70s or 80s? Onboard wifi and on demand movies would disagree with you...

Petrol engine - air and fuel is already mixed, compressed, and then ignited with a spark.
Diesel engine - these aren't premixed, the engine has to take the air in, compress it, and at around the time the spark would ignite, that is when a diesel has to get in all the fuel it needs.
The faster an engine turns, the shorter that window too, so you tend to reach a point where there's not enough time to squirt enough fuel in and let it burn.
Modern diesels all tend to be common rail high pressure injection, usually around 1600-2000 bar. Having that sort of pressure means you can get a lot of fuel in quickly, but it still is a struggle.
I would guess the Audi LeMans diesel GT car would run at pretty high pressures, and also since it has a lot more cylinders, it doesn't need a massive bucketload in each one.

Gas turbines constantly add fuel and air, so it doesn't have the limitation of a small window to do everything.

I know OP said turbine engine, but I'm pretty sure they that just meant a regular gas internal combustion.

Disagree. The tapes I used, in the 70s and early 80s, 9 track 6250 BPI in NRZI, used 4K up to 32 K byte records with inter-record gaps. Controllers could count records on the fly without moving data to ram, until you got to the record you wanted.

A lot like sectoring on HDD.

/Pedant_Mode_Off

Interesting note about that, because Arabic presents that same transliteration issue, a lot of U.S. units working in Middle Eastern countries had to pass out a standardized "you will spell names like this" guidance.

Because there was nothing keeping Soldier 1 from spelling a name Mohommad, and Soldier 2 from spelling it Muhammad, and then when the guy showed up on a base to look for a job, or clear security, whatever, Soldier 2 wouldn't be able to find "Muhammad" in the computer system, and the databases would be all messed up.

The flights I've been on in the past years don't even have those systems and instead they expect you to do everything on your mobile device.

I think it's implied that the sentence would continue "instead of single jacks like everything else has", but I guess it could apply to entirely different connection methods like bluetooth.

Most people are using their personal devices for entertainment these days. And most of these devices use Bluetooth or USB-C now anyway.

So why go through the expense of updating the old planes and headphones? They chose 2pin early on, so that became the standard.

Most planes have a 30ish year service life. So the older planes now are from the early 90s or so. So you should be starting to see more 3.5mm, as it was pretty well established as a standard for personal music players by then. The walkman had long since used it, for example.

But updating electronics for planes is expensive and time consuming due to regulations. So there will be some lag in terms of newer planes rolling out with it. And you're probably flying more older planes than newer ones, in general.

In the UK, card rejections are almost always to force a PIN entry - after a certain amount of time/uses of contactless payment by card.

Doesn’t happen when using phones (due to the use of tokens I think)

There are people out there who believe in this shit so much that they'd trust their job with it. I worked with a foreman who believed he could locate buried utilities like phone lines, power lines, water pipes, etc... with some dowsing rods he made out or #4 copper wire. Sometimes he would even second guess the locators markings & dowse them just to make sure. Those guys use specialized machines to locate buried utilities. I never had the heart to tell him & I just played along with it.

And the headphones worked like stethoscopes. They were hollow tubes that channeled the sound from the jack (which was basically just a hole) and the sound came through into your ears.

If I recall correctly, there is something called roughly "ignition delay", meaning you need some time for the fine spray of fuel to start vaporizing AND physically "cracking" the long hydrocarbon chains by heat and pressure in the cylinder, before it can burn properly/ideally/equally everywhere.

This is possible to achieve under 4-4.5k rpm, but further increasing revs means there would not be enough time for this process during each combustion cycle.

I am sure my technical terms are wrong, I only read about it in my native language, so maybe someone will correct me, but a very smart guy was explaining it roughly like this.

I miss the radio communication channel.

Thank you! It makes sense to not be bothered about everything. Guess I was doing that, lol. I was trying to understand everything from the code translation to execution and my brain was getting stuck.

Well, not that it wasn't allowed per se, but wasn't available. And yes, I remember scrolling through the 10+ channels they had and would listen to Classical Music between movies they put up on the public screens.

If you fly in premium classes, they offer better headphones, those have the two-pin jack. I stole one once, I thought I could covert it to a single-pin set up, I couldn't.

I guess it is worth mentioning that the typical lifespan of an aircraft is around 25 years. Planes are so expensive that they need to be built to last and they need to be operating to make money.

It is rare that a company would stop flying the plane just to update de phone jacks.

A dimension is really just a fancy name for a direction. The 4^th dimension is time. Although if you are talking about a literal 4^th dimension, hypothetically the string theory predicts 26 dimensions with 22 of them being hidden at the quantum level.

No, if you mix down a stereo signal to one channel it becomes mono audio. If you then send that channel to 2 headphones or speakers it's still a mono signal; ie you get the same signal in both ears.