When Otto Lürßen - only son of the company founder - joined the company as a partner in 1906, the focus finally increased towards building motor boats. In the years up to the First World War, Lürssen boats successfully took part in international races. In 1911 the Lürssen-Daimler speedboat with its 102 hp engine became the sensation of the racing season, reaching a speed of 27 knots, exceptional for the time. In the Mediterranean off Monaco, it won the unofficial world championship, the "Championship of the Sea". The speedboat went on to win the "Prix de la Cote d´Azur" and the Grand Prix des Nations later in the same year.