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Ohh Naiyo Naiyo> The missile needs to be closer to hinge otherwise the rotating momentum of the door will be higher, more effort will be required to open/close the door.
Not exactly a door, but here's a similar rotating assembly (swing out missile arm) that was used on the Boeing X-32. Not just farther from the hinge but also with a full sized 2000lbs bomb...pretty much 5 times the weight of a BVRAAM
Ohh Naiyo Naiyo> Also, bcoz the missile has to be punched off, it will add rotating recoil to door.
Four launchers that I've used are green and weirdly shaped as compared to the door ones. These are ejector launchers.
The launchers in the door are simple sliding rail launcher as used in wingtips of fighter. When closed, they're disabled (black) and enabled only when the door is opened to its maximum (yellow).
Ohh Naiyo Naiyo> Bcoz of these rotating turbulence, the FCS will have to be programmed to keep the plane stable. And sometimes the jet may have to launch while maneuvering, it'll further complicate the separtion.
F-35s have been launching missiles from a similar door based launcher for decades now. None of whatever you told happens.
And if your counter argument is that these are advanced AMRAAM that can be simply shot out blindly using LOAL, no need to guidance, can compensate...then here's F-22 using is wired ahh trapeze launcher to shoot vanilla LOBL (that required some stabilization) since I don't know how many decades
Ohh Naiyo Naiyo> Another point is that to launch single weaon the entire bay door should not be opened or it'll momentarily increase RCS during launch. Hence all 5gen jets use bi-fold doors.
When making extraordinary claims (like all 5th gen uses bi-fold doors) always try to back it up with some extraordinary evidence.
Here's YF-23 without bi-folding doors...just two huge doors that close one single large bay
In short
View: https://youtu.be/TKYI5UJTfVw?feature=shared