Originally Posted by
India Four Two
1045 sm at 207 mph gives a time of just over five hours.
I just had a look at a bit of information about DC-3 speeds and power... I think that these DC-3s used the R-1820 and had about 900-1000 Hp to play with. Not the 1200 Hp that the later versions of this engine or the R-1830 could deliver. That 207 mph is also the maximum cruise speed and not something you would use on a long sector. Something in the 170-180 mph range would be more realistic based on some Cruise performance graphs I found. Using 170 mph I get just over six hours for a no-wind situation. Factor the departure and arrival into it and some wind over that long track and we're pretty close to the seven hours figure we started with.