They're often called 'the greatest class of yachts ever created', and this week a fleet of rare J Class yachts is going head to head in a regatta in Falmouth.
The enormous 140 foot yachts were originally designed in the 1930's for the America's Cup. It's the first time they've raced in Cornwall for over 75 years.
Fog has delayed the start of racing involving J Class Yachts off Falmouth. It is hoped it will get underway this afternoon. The four super yachts were due to begin a series of races over the next four days.