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Paravane and "Aile d'eau"

posted Mar 10, 2011, 9:09 PM by Cesar Harada   [ updated Apr 24, 2011, 2:27 AM ]
In a recent update on the design page, I started sharing my concern about the behavior of Protei at high speed : from a certain speed, the articulated hull may start behaving more like a wing in the water than following the predictable rudder-dictated anticipated trajectory. 

Protei articulated hull dynamic trajectory

I wanted to make this into a blog post since that is a major concern that deserves comments, but since Protei may not navigate at high speed in order to collect oil, this topic may re-surface later.

And suddenly - of course - it became clear : Protei could possibly act as an "aile d'eau" with a water foil opposing the force of a kite, as described by Luc Armant in this amazing document :

Watching this video can help you understand the phenomenon : 

So, I am very eager to hear your comments about this, would this happen? I know this may be a later topic - unless someone says "well, you don't need great speed to start having the hull behaving as lateral water wing"... My question would be "How fast? Can we use that phenomenon to sail closer to the wind? Can we put this into math?"