Campbell set seven world water speed records in K7 between July 1955 and December 1964. The first of these marks was set at Ullswater on 23 July 1955, where he achieved a speed of but only after many months of trials and a major redesign of "Bluebird"s forward sponson attachments points. Campbell achieved a steady series of subsequent speed-record increases with the boat during the rest of the decade, beginning with a mark of in 1955 on Lake Mead in Nevada. Subsequently, four new marks were registered on Coniston Water, where Campbell and "Bluebird" became an annual fixture in the latter half of the 1950s, enjoying significant sponsorship from the Mobil oil company and then subsequently BP.