|Quoting c5load (Reply 3):|
One of my friends in the Air Force claims that the KC-10 Extender cruises about .85, did the DC-10 normally do this?
Though most airlines cruise DC-10s around M.82 (if I recall correctly), M.85 would be perfectly reasonable for the airframe if fuel burn wasn't a prime consideration.
The 747 varies a lot depending on weight, temperature, model, and airline procedures. 747-400s seem to be happiest between M.82 and M.86, with Boeing listing M.85 as a typical cruise speed. The VC
-25A often cruises in excess of M.88.
Not sure about commercial 737s, but our BBJs typically do between M.80 and M.82, though to get max range we need to slow them down a bit. Our 767 typically runs at M.80.
The speed champion of civil aircraft, at least for a while longer, is the Cessna Citation X. Most operators plan between M.85 and M.90. Under certain conditions, we've run them as fast as M.92.