ORIGINAL: tommy s
Both probably on models ,
plus air deflection just pushing on the wings from different directions makes them turn.
The light weight on model airplanes make them react a little different than
full scale. You are correct, a lot of sailplanes do not have ailerons and bank with spoilers
as does the B-52 bomber. I have flown full scale sailplanes and they turn very well
with spoilers only.
tommy s
The only way the light weight makes the models react differently to control surface movement>>>>>> wind gusts toss us around more. (which has nothing to do with how the controls work...)
The laws of physics don't change for the 3 to 12 lb sport models compared to a full scale 747.