From the Deboichet web site
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Everything that's old is new again. Like to hear what the experts think of this folly.
Hey Choco, pretty sure it was "canard". Great wave fins back in the mid 80's but as slow as a wet week. Im pretty sure Multi Fins sold a squillion of the buggers. 
the bottom right fin is very similar to the gsport lightwind formula fin. just a little smaller i guess.
I can see they may be useful for those tiny free ride fins.
Many years ago I experimented with a rotating canard, it had heaps of grunt, but was a pain to make, so I didn't continue with it very long.
