Compliments to Team New Zealand Winner of the XXXV America's cup..... 
Canting Keel

Cariboni's experience in canting keel systems dates back to 1996, when Junoplano was designed (right). Since then the concept has been continuously developed with different options (one or two cylinders) and additional features (canting and lifting systems).
Special attention has been paid to reliability, service ability and weight savings. The most reliable configuration uses two double Acting cylinders: in case of a cylinder failure, the system can continue to be operated using the other cylinder.

The aluminium transverse structure is designed to bear all the stresses generated by the cylinders, and to transfer to the boat structure only the righting moment through the bearings (#7 & #8, these are widely spaced to reduce forces to the minimum).

The longitudinal beams (#2 & #3) are primarily to avoid the structure collapsing in case of grounding. Both the cylinder bearings (#7, 7075 aluminium alloy, or 17-4-PH SS, or Titanium) and the keel pin bearings (#8, 17-4-PH SS) are self-aligning, to allow for minimum misalignment or displacement during sailing.
The cylinder tubes are usually made of 7075 Al alloy (Ergal), Titanium 6Al4V, 17-4-PH H900 stainless steel; the rods and terminals in 17-4-PH, Nitronic 50 SS, or Titanium 6Al4V.

The system is watertight: the central part (where the keel head moves) is flooded, but the cylinders work in a dry area because the two longitudinal plates (#4) and two rubber bellows (between cylinder and plate) seal the central area. A top plate with inspection hatches seals the upper face.