Originally Posted by
boeingbus2002
Would it be correct to say:
Best Angle Climb speed (Vx) is used to clear obstacles or for short runways intially. Then once commencing the next segment, Vy is used for economy etc.
But, as OLD SMOKEY has pointed out, Vy is not the best speed for minimum sector fuel. At least for his 777, he get further downrange on the same fuel by climbing at 320 kias vice 300 kias, at least for a portion of the climb.
And....if he's using cost index, where cost other than fuel is considered, then the climb speed would be even higher.
I'm just wrestling with the concept of cruising at the mach where maximum excess POWER is AVAILABLE. How close is this to LRC?