After the launch of the ATR72 in the late 1980s, there was a lot of talk about a further stretch of the ATR42/72, called the ATR92. As we all know, plans never materialized. I was wondering what the reason was - were there technical problems that made it difficult to stretch the ATR further - or was there simply no interest in such a large turboprop at that time (that's my educated guess)?
I am asking because ATR is now looking at a larger turboprop again, obviously as a reaction to a further Dash 8 stretch, but my understanding is that it would not be a simple stretch of the ATR72, but a new family of large turboprops with initially two members. One explanation could be that the ATR design cannot be brought up to Q400 speeds.
Any thoughts / background information?