I think I'm starting to get a clearer picture but could someone just confirm that I am understanding this correctly:
- For a given airspeed (ie. Vmo) a heavier aircraft would have to begin descent earlier than a light aircraft because, due to the increased momentum, it would require maintaining a lower rate of descent to avoid exceeding this speed?
- If asked to maintain a slower airspeed than normal on the descent, the aircraft would have to descend earlier because it would then be descending closer to its best Lift

rag angle of attack and would therefore have a lower rate of descent for the given airspeed?
Thanks in advance.