Hi everybody,
here's a question I`m thinking about
:
Situation:
You are cleared down to a e.g. 5.000 ft lower altitude with a clearance to proceed to a holding pattern which is lets say 50 NM away. You receive a EAT which is in e.g. 45 min. - so you will definitely end up doing your turns in the hold.
What are the most efficient speeds for this situation?
My suggestion:
- Green dot with idle power during the descent, since L/D max "without" (or with idle) thrust gives you minimum drag or minimum fuel flow.
- Upon reaching the cleared altitude which you have to maintain to enter the hold, increase speed to CI=0 to receive maximum endurance.
During climb CI=0 gives you maximum thrust available versus thrust required, ergo maximum rate of climb if needed. In cruise it gives you max endurance.
So why does everybody tell you to hold (in constant altitude) with green dot speed? (lets assume max. holding speed rule does not apply)
Thank you for you answers