J-20 5th Gen Fighter Thread IV (Closed to posting)

[Player99]

Hey，guys! ...No, not about 2012.12.21... I mean I just read on Chinese media that Americans reported on a new stealth fighter, J-18. Any news about it?

Now I just realized that this actually was old news and that remote controlled model was thought to be J-18, too. But the news just gets re-reported. So I'm still wondering if there's any validity to it, or is there any progress about the project, if it does exists?

 

[A.Man]

The Detail of the Great Workmanship-the Su-35 cannot teach Chinese anything close to this.

 

[Player99]

Well, it's been so many days since we last had some interesting news or pictures here. Then bear with me for some fanboy-sounding insider news: The J-20 will be, at the earliest, inducted in 2013 in small quantities while still being developed and put in more gadgets.

And also, I read somewhere that the J-20 just passed Mach 3 windtunnel test...

Believe it or not at your own risk!

 

[MiG-29]

Well, it's been so many days since we last had some interesting news or pictures here. Then bear with me for some fanboy-sounding insider news: The J-20 will be, at the earliest, inducted in 2013 in small quantities while still being developed and put in more gadgets.

And also, I read somewhere that the J-20 just passed Mach 3 windtunnel test...

Believe it or not at your own risk!

J-20 will never make it at Mach 3, fixed inlet, DSI is a fixed inlet therefore as the shocks move out and in of the intake will simply damage the engine, this type of news really ruin all this threads where fantasy basicly mixed with lack of knowledge.

T-50 can fly at Mach 3 but its inlet is with variable geometry.

 

[Totoro]

i was wondering, does excess air dump door in the intake count as a pure fixed intake? my prime example would be xfu8-3 crusader, which had a fully fixed intake but also had a door just in front of the engine for releiving pressure in the intake. granted, it never went past mach 2.39, though it is said the limit there was the cockpit structure, not intake and engine.

 

[Player99]

J-20 will never make it at Mach 3, fixed inlet, DSI is a fixed inlet therefore as the shocks move out and in of the intake will simply damage the engine, this type of news really ruin all this threads where fantasy basicly mixed with lack of knowledge.

T-50 can fly at Mach 3 but its inlet is with variable geometry.

Weren't we told that the DSI on the J-20 was adjustable? Let's just be patient and wait a couple of years. I have a feeling that China, if not crashing as predicted by so many, will surprise a lot of people again and again and again in the next 10 years.

 

[Quickie]

When the J-20 first came out, what looked like a lip-like structure at the inlet was speculated to be adjustable.

 

[MiG-29]

Weren't we told that the DSI on the J-20 was adjustable? Let's just be patient and wait a couple of years. I have a feeling that China, if not crashing as predicted by so many, will surprise a lot of people again and again and again in the next 10 years.

Sorry but you are wrong, J-20 can be tested at Mach 3 in terms of airframe but the intake has a design Mach number.

You can design a DSI that works for Mach 5 but it won`t work for Mach 2 or 3 why?

Simple each intake has a design mach number if you cross the speed the intake starts choking because of the movement of the shocks and spilling occurs.


A variable geometry is designed to change the geometry of the intake and by doing it the intake adjusts the design mach number according to the speed, DSI are fixed, So J-20 is limited to speeds of Mach 1.8

 

[MiG-29]

i was wondering, does excess air dump door in the intake count as a pure fixed intake? my prime example would be xfu8-3 crusader, which had a fully fixed intake but also had a door just in front of the engine for releiving pressure in the intake. granted, it never went past mach 2.39, though it is said the limit there was the cockpit structure, not intake and engine.

it does help it helps to fix the shock on attached on an intake cowl lip position as air mass is bleed, however as speeds go faster you need more shocks so you need a variable geometry intake that generate more shocks.

i won`t go more post about it you can google about it or go the aerodynamics thread we had before

 

[Player99]

Sorry but you are wrong, J-20 can be tested at Mach 3 in terms of airframe but the intake has a design Mach number.

You can design a DSI that works for Mach 5 but it won`t work for Mach 2 or 3 why?

Simple each intake has a design mach number if you cross the speed the intake starts choking because of the movement of the shocks and spilling occurs.


A variable geometry is designed to change the geometry of the intake and by doing it the intake adjusts the design mach number according to the speed, DSI are fixed, So J-20 is limited to speeds of Mach 1.8

I think you are too eager to prove me wrong to notice that I said we were told that this DSI was adjustable... We just don't know how exactly it was realized... and sure we are even not certain about this adjustable DSI rumor, but after all it is a possibility. That's why I suggested that we be patient.