How about this scenario.
I am in a closed stationary train and flying a model helicopter around a smooth circle. Nothing complex yet and the power is constant.
I stop the flying. The train accelerates to 100mph. Once it is steady at this speed in a straight line I start to fly my helicopter again.
Surely the power and smoothness of orbit in these two cases is the same despite the helicpter flying downwind (or even backwards) relative to the Earth.
Is this not akin to flying compass swings in a strong wind that L2 describes.
Why does one exhibit varying power and the other not ?
As I said initially, I am not saying that anybody is wrong here, I am just trying to understand where the difference comes in.
Thanks
TB