Alex, I did some tests on a falcon 50 simulator a while back and came up with e=.80 and Cdo =.225
I then computed for 39000 lbs weight and sea level that Pmin was at 142 ktas, and Thrust min was at 187 ktas.
And thus
Pr min divided by Th min = .759
As a check on my figures, the flight manual gives Vfs as 1.5 V stall.
V stall at 39000 lbs is 129 ktas, giving V fs of 194 ktas
This may seem reasonable, although V fs is for one engine out, giving increased rudder drag and windmilling drag.
The falcon 900 ex manual lists V fs as 1.43 V stall.
If you come up with any data/conclusions/equations, I'd love to hear. If posting here isn't appropriate, I can send you my email.
Good luck with your project
Hawk