J-20 5th Generation Fighter VII

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Volpler11

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Totoro said:
I would very much appreciate if someone produced a publication or any other paper on that topic. But haven't seen anything authoritative in years.
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The recent video on the J-20 pilot mentioned 1200 hours accumulated time over 10 years including flight school to start flying J-20. I would take that as a minimum flight time number.
 
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SanWenYu

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Bltizo said:
His information on Russia's Su-57 fleet is probably just a bit out of date.

Russia had 4 Su-57s delivered as of late 2021 -- though I suppose depending on how one defines the readiness of those airframes, maybe he only considers 1-2 of those 4 Su-57s to actually be able of conducting any sort of missions.


I wouldn't read too much into it.
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An honest questin, why do you think his claim isn't crediable?

He most likely was using 2 as the number of Su-57s in service for comparison. IMO, whether or not he used the outdated info cannot determine if his claim is correct or not.

If his claim is proved to be correct, the actual number will be close to 150 or even higher as of now. The significance of that is not about the credibility of him or his source of info, it is about that China is once again underestimated.
 
Blitzo

Blitzo

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SanWenYu said:
An honest questin, why do you think his claim isn't crediable?

He most likely was using 2 as the number of Su-57s in service for comparison. IMO, whether or not he used the outdated info cannot determine if his claim is correct or not.

If his claim is proved to be correct, the actual number will be close to 150 or even higher as of now. The significance of that is not about the credibility of him or his source of info, it is about that China is once again underestimated.
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If he was using 2, then that would still be some 160 J-20s. Even 150 J-20s would be pushing it.

But the issue is that his count for Su-57s is incorrect, which makes his overall thrust of the matter be less credible.
 
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SanWenYu

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Bltizo said:
If he was using 2, then that would still be some 160 J-20s. Even 150 J-20s would be pushing it.

But the issue is that his count for Su-57s is incorrect, which makes his overall thrust of the matter be less credible.
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If he said "40 times" instead of "80 times". Would you think his claim as credible then?
 
Blitzo

Blitzo

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SanWenYu said:
If he said "40 times" instead of "80 times". Would you think his claim as credible then?
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If only on the basis that it means he is not making basic mistakes for the number of Su-57s that Russia has, yes.

It was just a poor way to phrase a descriptor for J-20 numbers and an unforced error.
 
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nemo

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taxiya said:
A software language is just different format of "if then else end". Getting familiar with it is not a problem. The challenge is to build competence of understanding the mechanism of the real time OS that the compiled machine code runs on, such mechanism of task switching, data sharing, sequence of executions etc. Also need to master the compiler, so one knows exactly how every piece of humane readable source code is translated to machine code.

One can take a week of study to begin writing code in a new language and it will run. But it takes years to actually make the whole software to work efficiently, robustly. That is the reason why F-35 switches to C based because its code size is much much larger than any predecessors and ADA is simply a language that not many people is good at due to its narrow application.

At the time of ADA, real time OS is a new thing, C based language was not suitable for it because of the compiler. Today, after decades of development in both C compilers and many real time OS have matured to the point that ADA and its serving OS are unnecessary.
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The problem with ADA is that it is strict with how to do certain things and essentially force one to do things in a certain way. This is not a bad thing in avionics, since you want to limit possibility of errors. But not a lot of people enjoy working with this, so ultimately Pentatgon had to back off due to manpower limitation.

Some says ADA treats programmers like criminals; Pascal treats programmers like children; and C treats programmers like adults.

F22 predates vxWorks, if I remember correctly, and it is written in C/C++ anyway. F22 used proprietary real time executive, if I remember correctly again.

Note anything that flies has to be qualified. Qualifying any software is hard enough, not to mention full real time OS. So simplicity is a virtue in this case.
 
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