I think the weapon bay doors do fold like the F-22, you can see from pictures of the plane's underside the lines which indicate folds.
I am also wary in taking that as the standard opening speed for the aircraft. I'm not sure about F-22 or F-35, but it's not impossible for the bays to move at different speeds when firing in the air and for maintenance on the ground. I'd withold a conclusion until we see J-20 firing a missile from one of those bays.
I am also wary in taking that as the standard opening speed for the aircraft. I'm not sure about F-22 or F-35, but it's not impossible for the bays to move at different speeds when firing in the air and for maintenance on the ground. I'd withold a conclusion until we see J-20 firing a missile from one of those bays.