We received an order to improve the performance of the second X-73 for a Danish owner in 2002.

Our work identified specific areas which can be improved. One of these aspects involved a new keel with greater lateral area and stability, fitted with winglets aft on the bulb, so as to reduce the amount of weather helm as the boat heels.

A new keel according to our design was built in November 2002 and sailing trials held in December revealed a vastly-improved upwind behaviour and performance. We have now completed the design of a scoop to be fitted to the transom of this vessel (to overcome the problems associated with too much transom submergence caused by a greater-than-intended displacement).

We also designed a new rudder with a greater area to allow for a better course-keeping ability in following seas.