Originally Posted by
NWSRG
Was there not problems with engine-out performance? 1 lost out of 4 being very different from 1 lost out of 8? Think it was to do with assymetric thrust and control authority? But that could be my imagination!
You are remembering correctly, engine out performance and control authority in such a state was a concern, as were the other issues mentioned above. The 4 big fans did look neat in the renderings and fuel burn calcs however, and seemed "simple" in theory, then came the actual hard work...