Originally Posted by Slaanesh
Judging from the slowish rolls I would say rudder/elevator.
The P-40 in that video has R\E\A\T. I did the ailerons on that plane 4 years ago and it was my first ARF Cox micro warbird and I did not make the ailerons wide enough and they are too close to the root wing not to mention this plane has dihedral and is a bit under powered with the small outrunner and is a bit overweight with the 500 mah 2s lipo.
My later efforts with the Cox P-47 result in a much better aileron design that is wider and uses dual servos You have to start somewhere and the P-40 was the first to get ailerons and as we see they could have been better. The P-40 also uses a single servo ailrons setup that just does not have the deflection that a dual servo setup has.
In my P-47 build thread, Someone made a comment that the ailerons where "huge" on the P-47. As it turned out, they were just right.