In practise however:
Say a 767 GE powered, GW 140,000 kg, D/D speed 239 kts IAS.
Yet, holding at FL250 would be 223 kts IAS (from perf. manual).
What I'm trying to figure out: wouldn't best L/D speed give us greates range (good for D/D) and also min fuel flow (good for holding). What speed IS best L/D? And why would the two speed figures quoted above be different?
Thanks gurus!
