Re: Olympus engines Costs
The long and protracted development cycle, which our anonymous coward describes, well illustrates the shortcomings of the original subsonic Olympus for the task. Not all of them could be fixed by incremental redesign and the end result was not as low-maintenance or as well-integrated as a clean-sheet engine could have been.
Concorde was indeed efficient in supersonic cruise, but anti-noise legislation forced it to spend a lot more time subsonically than anticipated, and here neither the airframe nor the engine was efficient. And that of course would have affected a clean-sheet engine just as much.
But really, there is a better place for this discussion - see icon.