J-20 5th Gen Fighter Thread V

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lllchairmanlll

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Notice that the functional EOTS is not rear transparent. Field of vision might be less than the one on F35.
Here is the F35 EOTS
m02009062200116.jpg

Here is the J20 EOTS 捕获.PNG
Notice their minor difference in shape and rear panel. If this is the case, I guess the EOTS on J20 is more focused on A2A rather than A2G purpose. Simply judged from recent P2013 pictures, J20's EOTS might provide better forward field of vision and limited look-down, rear field of vision.
 

Blitzo

Lieutenant General
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Notice that the functional EOTS is not rear transparent. Field of vision might be less than the one on F35.
Here is the F35 EOTS
Here is the J20 EOTS View attachment 13484
Notice their minor difference in shape and rear panel. If this is the case, I guess the EOTS on J20 is more focused on A2A rather than A2G purpose. Simply judged from recent P2013 pictures, J20's EOTS might provide better forward field of vision and limited look-down, rear field of vision.

I think J-20's EOIRST looks like it is opaque at the rear simply because it appears darker due the actual sensor sitting at the rear of the housing, and the fact that our pictures are not very high quality... and also combines with the angle of the light.

We need higher quality images to see if the rear portion of the housing is actually opaque or if it's just the effect of the sensor appearing dark.
 

Air Force Brat

Brigadier
Super Moderator
Notice that the functional EOTS is not rear transparent. Field of vision might be less than the one on F35.
Here is the F35 EOTS
m02009062200116.jpg

Here is the J20 EOTS View attachment 13484
Notice their minor difference in shape and rear panel. If this is the case, I guess the EOTS on J20 is more focused on A2A rather than A2G purpose. Simply judged from recent P2013 pictures, J20's EOTS might provide better forward field of vision and limited look-down, rear field of vision.

Ahhh, Roger That!
 

Air Force Brat

Brigadier
Super Moderator
Can see vortex on back of wing.

So are you proclaiming to "see" lift like the Brat, actually the lift you are seeing is immediately behind the leading edge, and is a vortex generated off the trailing edge of the canard. That little tornadic action is a clue to the tremendous amount of energy sucking air molecules off the top of the wing, and in turn the relatively much higher pressure from under the wing racing to fill that low pressure vacuum and creating lift, the force is strong with this one!

it helps if you have spent time playing in a stream, or paddling a canoe, as you dip the paddle in the water, and sweep the paddle aft, the eddies under the water are visible due to air bubbles, as you sweep the paddle aft, there is a low pressure area behind the paddle as you move it toward the rear of the boat, and a high pressure area in front of the paddle, facing the rear of the boat.
 

Scratch

Captain
That little tornadic action is a clue to the tremendous amount of energy sucking air molecules off the top of the wing, and in turn the relatively much higher pressure from under the wing racing to fill that low pressure vacuum and creating lift, ...

Maybe the wrong place to discuss this specific detail, or perhaps I'm plainly wrong altogether. But in my (old fashioned?) understanding the higher pressure air from under the wing streaming around the tip to the top is exactly not what is creating lift, rather the exact opposite.
You do want to keep that pressure difference to experience lift. Hence all the effort with winglets and what not, on subsonic aircraft.
That vortex, by trying to balance that pressure difference is reducing lift and inducing additional drag.

Also, while the airstream tries to balance that pressure diffetential along all paths - and I'm not really firm as regards airfoil properties in relation to vortex creation - I was so far always under the impression that vortecies are created by airflow around the tip, and not primarily the trailing edge.
 
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