Your article may very well be the one I was referring to. I still have the mag somewhere in my stack. What I was calling an 'offset' tab is what you are describing as a boost tab, the tab moving in a direction opposite to the control surface. I guess, then, the question is whether there is some type of 'tab' that moves in the same direction as the control surface, but slightly more than the main surface-that's what I was calling a 'boost' tab. I'm trying to visualize the servo tab and how, or if, it would work on a model. Your reference to the airliners' use of both is confusing me, I can't visualize how that works. Maybe I need to dig out the article! Seems like that system would work well on model jets, e.g., those with all moving stabs that use mega powered servos, or double ganged, (got one of those U/C too- Su-27). I don't recall seeing any on models (jets), think there a good idea?