As an aside, If you want tosee D class cats in action, there is a short segment in the 1999 Film 'The Thomas Crown Affair' -
Linky to the IMDB The catamaran that Thomas Crown is seen racing in Long Island Sound is a D-Type Catamaran, an extremely fast and highly unstable yacht design from the 1980s. The D-Type's were designed by California based aeronautical engineers to try to break inshore multihull speed records. Today there are only a handful of them left in the world
