[mlangsdorf]

The mechanics of Caliph's fusion air-rams are 90% technobabble and game mechanics. Almost anything is justifiable, and it's mostly a question of what mechanics and play experience is desirable. I was mostly offering some reasons why vulnerable radiators at the back of the plane might not be desirable.

It is true that if an enemy craft is approaching from the flank, an aircraft would need to expose the upper surface radiators to roll into a reciprocal course - though turning away is safer since the radiators roll away from the flanker. I think that becomes part of the tactical maneuvering: if an enemy gets within effective laser range and bearing while flanking an aircraft, the flanked aircraft has to turn away (possibly into a twisting climb if it wants to re-engage) or accept that its vulnerable if it turns to engage. But I think that it is better if turning to disengage is generally safer, since that means that outmatched or losing fighters have a low risk retreat.