Su-75 "Checkmate" in Modern Posted November 24, 2021 2 hours ago, Giorgio N said: The same is true for the Rafale A, YF-22 and X-35, they were all technology demonstrators quite different from the later production aircraft. Of course, and for each of these programs the differences between the initial technology demonstrator, the prototype of the production version, and the final production version all differed. The level of maturity at which the aircraft was introduced into service also differed. The different countries, companies and even programs all had different development philosophies, so there really is no perfect 1:1 comparison. For example, the Russian T-50/Su-57 didn't have a true separate technology demonstrator - they combined the whole development process into one - probably higher risk but slightly compressed development time. On the other end of the spectrum, the EAP and Eurofighter were separate programs very far removed from each other, which is why I also split them in my previous post. Nevertheless, my earlier post does illustrate the typical lengths of the overall development time of a modern fighter and the Russians are very much in the ballpark there - even on the fast side with the Su-57. As noted by "Doom3r", the Chinese seem to be even faster on a few of their latest programs, but a decade+ is pretty much the norm. We'll see when this "Checkmate" flies and how long it takes to get one into service from that point. It is likely that the "in service" part shouldn't be expected in this decade, but there are so many things that can affect it either way.