A supersonic guided weapon has radiation sensitive apparatus carried behind a radiation transparent window the window being formed within an open recess in the weapon nose, the recess being such that at supersonic speeds it forms shock waves which trap air within the recess to provide a measure of kinetic heat insulation for the window and also a minimum of supersonic drag. An elongate nose region can be provided ahead of the recess to house further radiation sensitive or radiation emitting apparatus.

 
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