I"m new to flying models. But I can tell you from experience they make a difference on a real airplane. i used to fly a Jodel, that didn't have them on, and if you did a power stall, the stall was so violent, that the first time i did it, I slammed my head against the canopy. It took me by surprise. The right wing would drop first because the prop turning that way and the aircraft would be at 120 degrees before recovery. We installed stall strips, and you would never know it was the same airplane. The strips were supposed to be on this airplane and they weren't put on when it was built.

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