i have read about this being a myth many years ago, yet i still see it's not (it is only not noticeable on low rate turns) . I wont talk of ground speed...yes, ground is just a ball of dust but its the relation between momentum/inertia and relative wind speed. if you fly at 100Knt into 20Knt wind then momentum = (80^2)*mass....change your direction to tail wind position rapidly and your momentum would almost be the same ""like throwing pin ball in U shape track"" (the engine power will guarantee restore momentum relative to power setting but inertia wont let happen in zero time).....
NEVER MIND the physics stuff.....think of wind shear, it's a rapid change of wind direction...if you dont act against mild wind shear, you'll lose some IAS/ lift until engine power restores the momentum/airspeed .
The so called myth is a physical fact, theoretically possible but maybe non had ever encountered it coz it only happen with rapid turn rate...i dont know how much rapid but if for example you made a 180 degree turn from into wind to tailwind direction in couple of seconds then it'll take few seconds to pick your original IAS up again
Myth busting! I MIGHT STALL IF I TURN DOWNWIND!
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