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J-20's side weapons bay test photo, the missile looks like new PL-10
I think the intention was to avoid Aerodynamic drag(and strain) arising from those bay doors opening
The yellow parts fill up the "gap", so to speak, when the weapons bay closes. I guess this is done as an RCS reduction measure, but I could be wrong.
The question would be, what creates more drag, the bay doors of the F35, that opens only for a few seconds, or the whole process of opening, closing (twice) and the extracted rail launcher that will be out for the whole time. For the SR missile bays this systems might not be optimal, but I wonder if a similar system has advantages for the main weapon bay, since the doors there are bigger and draggier.
Just wondered, because these "gaps" could have been closed simply by making the doors a bit larger:
No it couldn't. The gaps are there so the guid rail could stick out when the bay door is closed.
I guess that partly explains the sheer size of that plane.....
it's not that big
It looks fatter than J-15, so it is a 40 tons aircraft no doubt.
Maybe it just has a larger wing area?