Bluebird K7
On 4 January 1967, the problems had all been fixed, the weather was good and Campbell decided he wanted to try and break the speed record. For a world record to be official, a boat trying to set a record has to make two runs at full speed that are timed by people who are not part of the record breaking team.  The official speed is the average speed of the two runs. On the first run Bluebird's speed was 297.6 mph (478.9 km/h) which was fast enough to be a new record, but not quite as fast as Campbell wanted to go. To set a record of more than 300 mph the second run would have to be 302.5 mph or faster.