Digressing from the thread:
Like the 'top rudder' in a steep turn it is easy for a student to misunderstand a briefing or to transfer a technique which may be appropriate in one phase of flight to another where it is not.
Student Basil was told that going above or below best glide speed would be inefficient and dispose of energy. Sitting in JP with instructor, Bas decided that energy was too high and stuck the nose down and shortly afterwards applied some energy killing g to raise nose and regain original speed.
At the subsequent debriefing it was pointed out that, whilst the technique would have been acceptable as a substitute for speedbrake at 20,000ft, it was not a recommended procedure at 1000ft on the approach.
My RAF QFI sat unflinchingly through the whole event.
