That's just wrong. Suppose your heading is east, with a steady 15 knot wind from the south. Fly (model or full-scale) for an hour. Both the model and the full-scale plane will be carried north 15 nautical miles in an hour. This business of different physics for models is just as wrong as the "I have videos so you're a fool" line that your fellow aerobat keeps pushing.

I've asked you several times whether applying rudder will make a model yaw. You refuse to answer. Why? The fact that it does has nothing to do with power, size, or wing loading. Deflecting the rudder creates lift toward the (now) curved side of the rudder. That makes the tail move toward that side. Even beginners know that.