|Quoting LMP737 (Reply 1):|
When the F-18 was being developed it was discovered it's approach speed was a bit to high.
I was going to say the same thing. From what I understand, the aerodynamics of the aircraft are so good that it doesn't induce the normal amount of drag that most others do. This is good for enroute portions of flight, but you need the drag on approach. Therefore, the stabs come inward to provide a vertical-flap type of system.
The only concern I have with this picture is that its at full power, with the burners lit. I can't see why the rudders would come inward at this power setting, unless the rudders are programmed to come in during regular flap settings, as you can see those are still deployed. If that's the case, then it makes sense because he would still have his flaps deployed from the previous approach. Looks like this guy just missed the wire or did a touch and go.
Hope this helps.