As part of an ITPS module on Stealth, I reproduced a Naval Postgraduate School exercise calculating analytically the RCS of the fictitious Mig-31 Firefox. To be more accurate, the RCS is approximated by modelling various aircraft components with simpler shapes which RCS can be analytically calculated.
However, I find that the modelling described in the original document is way over simplifying and highly overestimating the expected Mig-31 RCS. Some modifications were made, especially in the modelling of the engine inlets and exhausts to give more realistic values. Still, the exercise’s purpose is more to introduce students to some of the RCS concepts, rather than an realistic estimation. Followig the RCS peaks plot at 0 deg elevation angle.