The is one of the wings which become the system of ride control on the Super Yacht we are building at Echo Yachts.
You will see a large wing in the foreground and then another one further aft.
All in all there are 4 wings between the Trimaran hull form and a large flap under the transom to control pitch.
The system was designed by Naiad Ride control and it will work by way of movement sensors in the hull feeding the controlling computer and then swinging these control surfaces fore and aft, or up and down as the case may be to reduce the roll, heave and pitch of the vessel considerably.
Apart from looking very cool, the wings will also be an integral part of smoothing out the ride of the vessel.