Back in the NiCad days I built a 12 cell semi scale hydro with a lot of tunnel, and fitted a horizontal but cambered wing to reduce blowovers in windy conditions and cut a elevator into ito it of 1/3rd chord and a linkage from the rudder to it so it kept the arse end out of the water in the turns, it worked really well and allowed it to compete on even terms with riggers in most conditions.
These days I would make it trap less air as it is easy to get too much lift in the tunnel, I would make the wing horizontal, fixed and symmetrical in section so it only provides any lift if the nose rises. I haven't made one in the LiPo era though, as we don't have seperate classes and without lift being an advantage they lose to modern riggers down the straights as well as in the turns, and in all conditions.
Paul Upton-Taylor, Greased Weasel Racing.
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