CSK and Hawaiian Catamarans 

Rudy Choy gained a lot of sailing and building experience with Woody Brown's Manu Kai in 1947 and second version called Alii Kai This lead them to design and build another version called Waikiki Surf in 1955 40 feet long and 13 foot beam. Cutter rigged with a bowsprit she was given accommodation and equipped for longer ocean racing and cruising. Brown and Choy sailed her to Los Angeles but were refused entry to the Transpacific race from Los Angeles to Honolulu so the boat’s owner with another crew (Brown and Choy had to leave the boat) shadowed the race instead and finished fifth despite a stress crack in one of the hulls.

Choy was asked to design and build a larger ocean racer, and he came up with Aikane launched in April 1957. They took her in the Trans Pac race unofficially again as entry was refused and this time beating the fleet by 26 hours.

In Hawaii others followed Choy in the 50's building similar big Tourist beach cats like the 63 foot Ale Ale Kai III.

Rudy Choy, Alfred Kumalae and Warren Seaman formed CSK and became a hugely successful design team between 1957 and his son Barry Choy  carried on Choy Design in Honolulu. In the 50's and 60's CSK were designing yachts for millionaire businessmen and movie stars that took up ocean racing in their spectacular catamarans which established many records. The 43-foot World Cat circumnavigated 1966 to 68. 

Rudy was without doubt one of the creators of modern catamarans.