RE: What are boost tabs???
Just so we are clear, then, there are two ways of operating the tab. You can directly control the tab, and use it to move the surface. This requires that there be enough airspeed over the surfaces before the tab will move anything. The other way is to power the surface and mechanically connect the tab to assist the movement, sometimes called a 'balance tab'. Of the variations, there's plenty, but they all work in a similar fashion. Which way you go is then up to you, though as at least one has found, if the servo stops working it don't matter which bit you are controlling, it still won't move.
Evan, WB #12.