Bluebird K7
Campbell had been using his father's boat, Bluebird K4, to try and set new records.  Bluebird K4 was destroyed when its structure broke. After this, Donald had the idea for a jet powered hydroplane to take the world water speed record from the American propeller hydroplane Slo-mo-shun. Ken and Lewis Norris designed and built K7 based on Donald's ideas.