
garrya wrote:Bay opening might increase RCS for a few seconds, but that doesn't mean F-35 suddenly have the same RCS as Typhoon or 747. Heat from weapons such as SPEAR, JSM, GBU-53 is negligible, much smaller than aircraft itself. Besides, one important drawback of IR system is that their max range is only achieved at minimum FoV. With wide Fov, the range is much shorter, so unless they already looking at F-35, the distance which they can detect the heat signature from the weapon is even smaller. What else? Infrared radiation can't penetrate cloud so F-35 can actually hide the missile launch very easily.
On top of that you have a fusion engine and MDF cues to tell a pilot where the OPFOR EW sensors are and your detectability from each of them with orientation.
Plus F-35 has huge tail feathers and integration of all flight control surfaces which allows the aircraft to sustain a high yaw angle, or else sustain a high AoA in any required vector or orientation, in order to face the open weapons bays away from any active sensor that is within a detection footprint. An advanced auto-pilot sequence could take advantage of the fusion and MDF cueing to automatically orient the aircraft so that it can always launch A2A or A2G weapons without the opening bay being exposed to even a temporary detection potential.