Originally Posted by
sky9
I see that Inmarsat have used a speed of 450 kts for their calculation. Assuming that a 777 operates at 0.84 or there abouts that equates to a TAS closer to 500kts.
How would that affect the arcs that they have published and how far down those arcs the aircraft might have flown.
What is the T7 range speed? It would not be 'thereabouts'; it is either 0.84 or it isn't.
The speed of 450 kts groundspeed predicates a constant wind iro 60 kts head wind assuming an OAT of -40C and my memory and calculation being correct which give a TAS of 510.