(a) Mutt ... good ... the more we can put the wind up people the more likely they will be to take the subject seriously. Far too many folk fall into the trap of getting so used to the AEO case (and, for twins - especially, AEO is real good) that they subconsciously see the OEI problems as being far less significant than they are.
(b) Rainboe .. or to put it another way .. not suitable for doing it on the run .. the sums need to be done beforehand in a competent engineering manner.