ORIGINAL: cfircav8r
Yes, crab is set to counter the drift and crab is just a heading change to compensate for that drift. There should be no different control input than is needed for a normal turn. You just turn more or less, than you would without wind, to establish the crab angle. As you get lower the wind speed can vary somewhat and therfore your crab angle may need to change, and you do this again with small normal turns to adjust heading. When you reach the runway start the flare and just before touchdown use rudder to straighten the nose to align it with the runway. At this point you should also be adding a small amount of aileron into the wind to keep from drifting, and increase it after the plane is on the runway. Again trim for a good approach speed and throttle for glide slope.
In my experience, I agree 100% with this post. Yes, crab is a heading change to compensate for drift. And I will say again, with a strong crosswind and using only ailerons, I keep a sport airplane on the centerline of a runway on approach without using rudder.