Originally Posted by FlexibleResponse
...and vice versa...a rapid air mass direction change...or a rapid aircraft direction change.
Except the aircraft eventually
does change direction with the changing air mass, and not the other way around. After all, the air mass is supporting the aircraft - not vice versa.
Imagine a motorcycle being ridden in a straight line on an aircraft carrier. If the aircraft carrier turns left, so does the motorcycle (in relation to the earth) - even though it's still driving straight. Now, put the same motorcycle on a runway and ask the rider to make a left turn. The motorcycle again turns left (in relation to the earth) - but the runway hasn't moved.
In both cases, the rider feels centrifugal force as the motorcycle banks left due to their combined inertia and needs to use the same leaning force into the same rate of turn to remain astride - even when he's riding "straight".
So you'll forgive me if I don't fully understand what other forces are at work to change the direction (air speed) of an aircraft in a constant angle of bank in a constant air mass.
Assuming drag, lift, thrust and weight don't change in a constant turn (in a constant air mass and density), what other force is there to upset the lift-weight/drag-thrust equation to cause velocity (air speed) to suddenly change?