An aircraft's response to changing wind is dependent on the inertial mass and drag of the aircraft.
A light aircraft will respond quickly to adapt to changes in the velocity of the air mass (through wind changes or maneuvering in a constant air mass) and a heavy aircraft will take longer.
Inertial mass is space/time dependent for frame of reference.
However, on the other hand, the kinetic energy of an aircraft flying at 100 knots IAS into wind will be lower than the kinetic energy of the same aircraft flying downwind at 100 knots, in RELATION to the EARTH.
The increase in kinetic energy required to change from flying into wind to flying downwind takes time and is dependent on the inertial mass and drag of the aircraft.
Perhaps I should say mass and density instead of mass and drag...but you will appreciate the relationship between the two.
The answer to the downwind turn lies in whether the aircraft has high mass and high density at one end of the scale or has low mass and low density at the other end of the scale.
Consider a rubber-band-powered balsa wood toy aircraft of a few grams turning downwind...yep, no easily measurable change in IAS. But a huge change in groundspeed.
Now consider a ballistic bullet fired in a straight line through a multitude of wind velocity changes. When the bullet experiences a headwind or a tail wind change, does the IAS of the bullet remain fairly constant or does the groundspeed remained constant?
Those who have experienced operating high mass and high density aircraft at low airspeed and rapid maneuvering at low altitude in high winds have a tale to tell...but only to those who might listen.
Vincent Chase's comments about his flying in a fully loaded cropduster indicate that he has experienced the phenomena causing him to crash. But he survived and has learned the bitter lesson of the downwind turn. He has a tale to tell...but only to those who might listen.
Good luck to the other Sky Gods.
In a previous life I use to drop bombs using a manual aiming system. The bombs pretty much fell to earth in accordance with the laws of Newton.
Unfortunately, the air mass velocity at the altitude at which they were released was always different from the many changes in wind velocity that the bomb saw on the way down. This would cause the bomb to miss the target. Therefore we had to compensate with an offset aim point by calculating an average wind velocity.
The offset was determined by applying the average wind velocity to the drift acceptance factor of the weapon. Heavy and high density weapons had a smaller drift acceptance factor than lighter and low density weapons which were obviously more affected by wind velocity changes.
Be careful when you think that you know everything about aviation...