JF-17 Block-3 -- Updates, News & Discussion

[Dazzler]

VFSD ventral fuel sink duct / bypass duct

So much for liquid cooling for aesa.

View attachment 777473View attachment 777474
Congratulations sir, I think you found it by accident...
It think it hasn't been installed yet...
Liquid cooling confirmed ?
That's some big pipes for liquid
Circulation system complete

Or with respect to the B crash...

The video is two months old, before the crash.

 

[Iron Shrappenel]

So much for liquid cooling for aesa.

The video is two months old, before the crash.

Thank you for time stamping the video.... How long now for the first A-3 to fly then from Kamra ?

 

[messiach]

What?

So much for liquid cooling for aesa.

The video is two months old, before the crash.

 

[Iron Shrappenel]

VFSD ventral fuel sink duct / bypass duct

Hi mam, what is a vfsd to begin with......
Is it a necessity to pass it through the nose of the aircraft ?

And if the requirement isn't for it to pass through the nose. Would it be to cool off the electronics ?

 

[messiach]

Dual-phase cooling.

View attachment 777479

Hi mam, what is a vfsd to begin with......
Is it a necessity to pass it through the nose of the aircraft ?View attachment 777480
And if the requirement isn't for it to pass through the nose. Would it be to cool off the electronics ?

 

[Dazzler]

Dual-phase cooling.

Dual phase cooling is highly efficient for cooling aesas. It also suggests that the radar required a decent cooling solution. I'm talking about klj7A

 

[Aesterix]

Dual phase cooling is highly efficient for cooling aesas. It also suggests that the radar required a decent cooling solution. I'm talking about klj7A

Or it could be coolant coming in from one side and going out from the other, but to where and from where?

 

[Dazzler]

 

[Marker]

I asked a sq leadr frnd who is an engineer and works on JF17. He told me what the pipe is for but i am not going to share it here . Let it run for 100 more pages.

My guess: The pipe is coming from the engine compressor. IMO high pressure compressed air from engine compressor is being used to run mini turbine - compressor combo for the liquid coolant used in heat exchanger. In addition to this arrangement, there is also another possibility that this high compressed air might also being used (venturi effect) for cooling purpose.

 

[Dazzler]

What?

One B crashed last month.

 

[maverick1977]

so total 3 crashes in 8 years ?

 

[SQ8]

Dual-phase cooling.

Assuming 1100TRM and peak power of GaN at 10w.. that’s 11kw peak and averaging 1.1kw with heat dissipation needed usually 1:4.. unless I am getting some basics wrong.

So the RD-93 can manage that much?

Considering that the twin AL-31s on the MKi need to generate close to 17kw max for their PESA? Maybe I am mistaken on the figures

Dual phase cooling is highly efficient for cooling aesas. It also suggests that the radar required a decent cooling solution. I'm talking about klj7A

Coolanol or PAO coolant?


Interestly, I read that at high off boresight angles AESAs are worse off than a MSA which is where the swashplate came in for newer proposed AESAs.

so total 3 crashes in 8 years ?

Yes -
1st was structural failure
2nd was CFIT
3rd is reportedly bird strike

 

[Aesterix]

Assuming 1100TRM and peak power of GaN at 10w.. that’s 11kw peak and averaging 1.1kw with heat dissipation needed usually 1:4.. unless I am getting some basics wrong.

So the RD-93 can manage that much?

Considering that the twin AL-31s on the MKi need to generate close to 17kw max for their PESA? Maybe I am mistaken on the figures

Coolanol or PAO coolant?


Interestly, I read that at high off boresight angles AESAs are worse off than a MSA which is where the swashplate came in for newer proposed AESAs.

Yes -
1st was structural failure
2nd was CFIT
3rd is reportedly bird strike

And that's why the speculation that a better engne may be used for Blk 3

 

[CriticalThought]

I believe here's the exit?

View attachment 777446

During flight that chute tube is pressurized and no air would be filling into it. Look at the pictures I posted, the opening on the front is going into the vertical tail.

 

[Dazzler]

Assuming 1100TRM and peak power of GaN at 10w.. that’s 11kw peak and averaging 1.1kw with heat dissipation needed usually 1:4.. unless I am getting some basics wrong.

So the RD-93 can manage that much?

Considering that the twin AL-31s on the MKi need to generate close to 17kw max for their PESA? Maybe I am mistaken on the figures

Coolanol or PAO coolant?


Interestly, I read that at high off boresight angles AESAs are worse off than a MSA which is where the swashplate came in for newer proposed AESAs.

Yes -
1st was structural failure
2nd was CFIT
3rd is reportedly bird strike

Per a catic source zhuhai 18 the export customer opted for swashplate aesa.