Has anyone addressed how these rudders are used in water of unknown depth? I've kicked up a rudder or two in areas I thought were deep enough (the Keys mostly), and while it's a pain to run back and reset, at least it didn't break the rudder.

The same is true for hidden lobster trap lines that aren't marked or are somehow sitting below the surface. If the T-foil rudder caught one at full tilt, would it kick up (or out, or something), or just bring the boat to a screetching halt?

If there is no provision to kick up, would it be prudent of the sailor to keep the minimum daggarboard depth greater than that of the rudders?