I would expect to see smaller movement of the flaperons when they are lowered for landing. My model did the same thing. It's done to reduce adverse yaw.

American Naval fighters such as the F-18 something similar. When the flaps and ailerons are lowered for landing, roll control is transferred to the tailerons.

Unlike American fighters though, the Flankers only reduce the aileron throw. If you watch the end of the video I posted, you can see that the Flanker has the flaperons drooped, and while the control throw is reduced a little, it still does mix flaperons and tailerons for roll control.

I'll take a look at my Flanker video library. I think I've seen footage that shows the flaperons and tailerons working together during high-speed airshow-type maneuvers.

Yes, I read the thread. That's just it. There is no hard and fast rule concerning roll control on the tail. It all depends on the airplane in question.

I've built and flown several different Su-27 models. Two with taileron controls (stab/elevator & stabilator), One with ailerons/stabilators that was also could be changed to fly with and flaperons/tailerons. My brother's Flanker had full-time ailerons and stabilators. They all flew the same. Roll control was effective (without excessive taileron throws) regardless of the control configuration.

My brother Daren built a small model of an Airbus Beluga and tried to use taileron control and it was completely ineffective in the roll axis.

On the Flanker family of aircraft taileron controls alone are effective because the tail span is equal to the span of the ailerons. On the Beluga, the tail area is enough to stabilize the pitch axis, but too small for the roll axis.

You can't use tailerons on the F-4 because of the extreme anhedral. When you deflect both surfaces to roll, it acts like an inverted V-tail and yaws instead. And, you have to limit the flap travel on Flankers, etc. because of the turbulence washing over the horizontal tail.

Like I said, on the Flanker family of airplanes the mixing is full-time, unlike American fighters which transfer roll control between the ailerons/flaperons and the tailerons depending on the flap position.