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

[delft]

No doubt it has been reshaped, there are several possibilities, I believe the most likely is to smooth the airflow at higher angles of attack, both into the engine intake itself, and over the top of the upper fuse/wing juncture.

If you picture the aircraft at a 40+ degree angle of attack to the relative wind, the old configuration would no doubt cause turbulent airflow behind the inlet, which would likely detach, "spoiling" the laminar airflow over the forward fuse, and reducing total lift available at the higher angles of attack that could impede "turning rate" and increase "induced drag" which would rapidly 'bleed energy".

On the inlet side of the intake, this new configuration would "smooth" the airflow into the inlet, providing a much more consistant volume and flow into the hot-section promoting a cleaner burn, less likely to flame-out at high alpha, which can cause a very dangerous VMC roll into the dead engine, caused by an assymetric thrust condition.

This would allow further opening up of the flight envelope, to include higher angles of attack, with a much reduced risk of flame-out, sudden departure, and buffeting, each of which are a concern as AOA increases along with G-loading????

I think the vortices from the stakes and canards will prevent flow detachment. And a laminar flow is more prone to detach than a turbulent one.

 

[Air Force Brat]

I think the vortices from the stakes and canards will prevent flow detachment. And a laminar flow is more prone to detach than a turbulent one.

Yes,, of course you are right, and I was thinking turbulent airflow off the canards even as I typed laminar,,,,,,I do believe the airflow is much smoother over the reshaped inlets and that's prolly what triggered laminar,,, duh! Thanks for catching that, and I was just looking over the variable inlets on the F-15, they were tested at Arnold AFB in Tenn., not far from my old home in Murfreesboro. Tn., they had a huge windtunnel there..... brat

I'm sure someone has blown some blue smoke over this baby in the US as well as Chengdu. LOL and I for one would love to see the compare on these two inlet designs.

 

[nkvd]

I am just dying for just a few high res pics

 

[kwaigonegin]

Is it just me, or the weapons bay opening might be wider than before? It seems the hinge points for the doors are pushed further to the side to where the bottom and the vertical sides meet.

I know, the pics are blurry, and this could also be due to the angle.

Man! that is one massive fighter! I've been up close and personal to many an airplane but just looking at the beast next to the humans really put things in perspective.

 

[Equation]

Why is the HUD in a red/ orange color on this latest J-20 pic or is that something else?

 

[no_name]

WOW. The entire upper part of the fuselage looks like it's been reshaped.

EDIT: Or it's still just the upper part of the intake. Whatever the case it looks extremely different from this angle than it used to.

This was pointed out when the pics of 2011 first camed out:

http://www.sinodefenceforum.com/air-force/j-20-new-generation-fighter-thread-iv-168-6233.html#post265334

 

[nkvd]

Why is the HUD in a red/ orange color on this latest J-20 pic or is that something else?

Nice catch. I am shocked i missed that but nontheless i am inclined to believe that its just an illusion and green is still the colour

 

[Blitzo]

Red is probably just the colour of the HUD cover.

 

[nkvd]

Red is probably just the colour of the HUD cover.

Now thats more likely

 

[by78]

Why is the HUD in a red/ orange color on this latest J-20 pic or is that something else?

Hmmm... Looking back at other photos of 2011, the HUD was indeed green.

I think it's just an optical illusion of some kind or a HUD cover as seen on this Eurofighter:

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