Well, TSR.2 was designed for exactly the sort of mission that the Tornado filled.
What were the potential problems with it? Well, the airframe was pretty good, the engines worked well enough.
I think that the avionics fit was pretty ambitious and might well have proved troublesome.
The aircraft’s electronics were complex and varied but almost completely new. The navigation system was based on a doppler / inertial system that was updated by the radar. The nose radar was for weapon delivery and terrain following, while the sideways-looking radars could be matched against maps to aid navigation. All data output was fed into the central computer which governed the flight of the aircraft via the automatic control system. The TSR-2 could also be equipped with a comprehensive reconnaissance set-up which could be aided by the sideways-looking radar.
A better approach would have been to be less ambitious with the first version, maybe use some existing systems, with the intention of developing later upgraded versions.
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