Originally Posted by LeftBreak
Time to PNR = (Endurance x GS home)/(GS out x GS home)
And just how are you going to calculate that Endurance when some of the flight is at Cruise Fuel Flow, and an unequal portion of it is going to be at the low level Depressurised Fuel Flow?
What you say works within limits for Normal Cruise Out and Normal Cruise Home, but
NOT when 2 different sets of winds, and 2 different sets of Fuel Flows prevail.
Regards,
Old Smokey