Q: What is the dominant variable in longitudinal stability?
A: Power.
You claimed many times to have answered that and other questions. Show us where.
But let us continue the charade that you do have that aviation 'background' and 'study'...
Q: What does asymmetrical thrust and yawing moment affects?
A: The aircraft's true path.
How freaking basic is that for any aspiring flight controls engineer? Potential asymmetric thrust condition comes with multiple engines, even when they are as near to each other in the fuselage as on the F-15, further apart in the fuselage as on the F-14, and greatest when they are on the wings like on the airliner. Yawing moments are created in crosswinds or in front mounted single prop slipstream over the fuselage and flight control surfaces. Deflections of the rudder are necessary to create counter-balancing yawing moments to keep the aircraft on its true path (heading). Manual deflections via the pilot's rudder pedals are usually for small prop jobbers. Automated are usually compensated through the flight control 'putah (FLCC) like on the airliner.
Stalls Explained
The working flight controls engineer must know this effect to work with the aerodynamicists and pilot to create a safe and functional aircraft.
On a side note -- In small scale modeling, because it is not possible to scale down air molecules, these forces are powerful enough on these smaller bodies that they gives these small aircrafts maneuverability that is not possible with their much larger brothers. That is why that video with the small scale J-20 cannot and should not be taken as representative on the real aircraft's maneuverability. Only the technically gullible would take that video seriously and we know who they are in this forum.
Now that is a dozen basic aerodynamics and 6 or 7 flight controls engineering questions that you could not answer despite claiming an aviation 'background' and 'study' and tried to use it to shut down the Indians.
Q:In a 'bicycle' landing gear configuration, what item counter-balances another item? Hint: High speed.