The 3mm thick keel cooler plates are around 5" wide in the garboard. Improves the hulls shape and provides good surface area to dissipate engine coolant heat.
The keel cooler actually ends where the small vertical weld is about 18" back from the leading edge. (There is a 32mm galvanised coolant crossover pipe inside here). The leading (and trailing) edges of the cooler are actually sealed voids to make a faired in shape. welds are all ground flush with the hull to reduce any turbulence and drag, which should improve keel performance upwind.
For those interested in wylo winged keels heres a few pics, below is the frame up.
The wing plate is 3mm steel, templated and welded on. The triangular frames are visible. A small modification to the winged keel design may be beneficial from a building perspective here. It probably would have been easier to make if the wing keel top and bottom plates meet each other edge to edge , and not tucked in 1/2 inch from outer edge as per design.
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