Originally Posted by
Meikleour
Most people seem to agree that airspeed fluctuations due to windshear are the result of the aircraft having an inertial groundspeed which causes the changes to be apparent as it experiences differing air masses and takes a finite time to regain its momentum ......................now, when flying in a stable but moving air mass where does the effect of aircraft momentum go? (why is it always ignored?)
It's not ignored, just often misunderstood.
An aircraft turns by tilting it's lift vector. Lift is proportional to airspeed, not ground speed. Momentum is relative to velocity which is relative to a frame of reference. It is not exclusively proportional to ground speed.