There the two types of tabs, the boost tabs and the trim tabs, and a few combined. Most of these problems are just ignorance of the mechanics of them. The guys with the scale model that was using it for a trim tab just didn't have enough servo power, period. Trim tab or not. One of the assets of the Corsair was its agility when taking on the Zero because of the servo tabs. One elev. had the servo tab, the other a trim tab. One of these days I'd like to take one of my 40 odd inch foamys and put micro servos on it with servo tabs just as an experiment.