It's a 40%.

Those are booster tabs and actually drive the ailerons or help drive them depending. It's an excellent way to only use a couple of aileron servos instead of a line of them along each wing. Driving the tab in the opposite direction you want the aileron to go moves the aileron in the direction you want it to do. Aero does the work for you. One servo to drive the tab. Amazing why it's not done by everyone. The idea that it isn't as accurate seems to be a joke looking at that airplane do what it can do, which is what every other one of 'em can do. He just does it with less equipment, weight, and expense. Go figure.