Since the RAH-66 came up, here's a few things about the program. The aircraft flew late and never met its performance and systems goals. It suffered a protracted and delayed development and it was projected that the Comanche if it continued would use up 40% of the entire Army aviation budget. After all the years of work, there didn't seem to be much progress resolving problems including weight and engine power(the engines met the specification, but that wasn't enough power to handle the Comanche's weight growth. It never reached LRIP, in fact only two airframes were ever completed.
A lot of folks involved with the program were so fixated on it that they didn't realize what was happening in the real world. A classic example: Boeing spokesman John Morrocco spoke on the record with the following statement: "The Comanche program is on track and schedule". ...The program cancellation was announced the next day.
Let's hope we don't make the same mistakes with FARA. One thing that should give us pause is that the FARA program manager has publicly stated that an aircraft that meets all the performance requirements in the specification can't be built. His exact words were that the requirements, "...are not compatible with the laws of physics.”