Collisions are a very complex issue. First you must find the point of contact for two complex shaped a/C. Second, you must find the force to apply to each A/C part or maybe if it is extream force to blow up. Third, you must apply the damage based on the force to each A/C.
Here is a thread on the BOBII forum where a tester ran a test with a fighter ramming the tail of a bomber (historic mission) and his results:
http://a2asimulations.com/forum/view...p?f=10&t=26497
BOBII got it wrong badly and COD almost got it correct (with some minor problems). COD damage model is very good but may need some polish for the minor issues.
Also collisions take time to test so maybe some other players can test and report on the ramming mission here..........