Surf powerboat racers from all over the country are at Watergate Bay this weekend for the Thundercat National Championships.
Powered by 50 horse-power outboard engines, the four-metre-long inflatable catamarans can reach speeds of up to 60 mph.
It's the second time the national event has been held in Cornwall.
More top news
Mild tonight and dry and sunny tomorrow. Turning unsettled again later. The forecast with Luke Castiglione.
Around fifty thousand people have turned out on the Hoe in Plymouth over the weekend to support Armed Forces Day.
Luke Castiglione has the latest weather forecast. Cloud with rain this afternoon, becoming dry and sunny tomorrow