The problem with any foil that you attach to the lower unit it, you are now introducing lift via the outboard. This is transferring force to the transom vertically at the engine mounting bolts. For most dinghy's these are just screwed tight and not through bolted.
Ideally, the boat should be planing as a result of lifting forces on the hull. Trim tabs and proper trim through load distribution is the better solution IMHO.
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