First Sunseeker 131 Launches From UK Builder Prominent UK builder recently launched the first hull in the brand new 131-foot series. The elegant yet sporty lines are unmistakably 'Sunseeker' and that deep 'V' hull formed from GRP materials are sure to assist this boat on her performance-oriented runs. With the standard engine configuration, the Sunseeker 131 is expected to reach a top speed of 25-knots. Trials haven't been completed as yet so this figure is preliminary. Just under 27,000 LT of fuel will be available for use once the tanks are filled to capacity.