Blue Bird K4 was a powerboat commissioned in 1939 by Sir Malcolm Campbell, to rival the Americans' efforts in the fight for the world water speed record.
The name "K4" was derived from its Lloyd's unlimited rating, and was carried in a prominent circular badge on the forward hull. As this was Campbell's second boat, it was also known as Blue Bird II. He used the name for a series of land speed record cars, his record boats and also his motor yacht. [lower-roman 1]
K4 was built by Vosper & Company as a replacement for Blue Bird K3 , which had set three other water speed records for Malcolm Campbell before the K4 was built. It also used the same Rolls-Royce R engine.
K4 was a three-point hydroplane. Conventional planing powerboats, such as Miss England or Blue Bird K3 , have a single keel, with an indent or "step" projecting from the bottom of the hull. At speed, the force on this step is enough to lift the bow upward, reducing the wetted surface area of the hull and thus also the frictional drag. A "three pointer" has two distinctly separate floats fitted to the front, and a third point at the rear of the hull. When the boat increases in speed, most of the hull lifts out of the water and planes on these three contact points alone. These points, being even smaller in area than the planing hull of a monohull hydroplane, have even less drag. Having a broad spacing between the front planing points, the three-pointer is less susceptible to instability caused by small disturbances than is a monohull. However, if the bow lifts beyond its safety margin, the aerodynamic forces (not the hydrodynamic forces of the water) on the broad forward area of the hull will cause it to "kite" upwards, leading to a somersault and crash. This is what happened to both Slo-mo-shun and (possibly) Bluebird K7 .
K4 set one world water speed record on 19 August 1939 on Coniston Water, Lancashire (now in Cumbria, at 141.740 mph (228.108 km/h or 123.168 kn).
After the Second World War, Sir Malcolm unsuccessfully re-engined K4 with a de Havilland Goblin turbojet engine but did not gain any records. The new superstructure did gain the nickname 'The Coniston Slipper' . [1]
Donald Campbell (Malcolm's son) had not previously attempted record-breaking, but after Sir Malcolm's death at the end of 1948, the threat of an American challenge to his water speed record spurred him to defend it. Under the terms of his will, Sir Malcolm's possessions, including the record breakers, were auctioned off and Donald was forced to buy them back. K4 was then re-engined with a propeller and one of the previous Rolls-Royce R engines.
Donald tried the boat but deemed it too slow; after another superstructure rebuild, and a final structural failure in 1951, it was replaced by the jet-powered Bluebird K7, in which Donald set several records, then died during a final record attempt in 1967. [1]
A replica of K4 currently is on show at the Lakeland Motor Museum, Backbarrow.
Donald Malcolm Campbell, was a British speed record breaker who broke eight absolute world speed records on water and on land in the 1950s and 1960s. He remains the only person to set both world land and water speed records in the same year (1964). He died during a water speed record attempt at Coniston Water in the Lake District, England.
Offshore powerboat racing is a type of racing by ocean-going powerboats, typically point-to-point racing.
Major Sir Malcolm Campbell was a British racing motorist and motoring journalist. He gained the world speed record on land and on water at various times, using vehicles called Blue Bird, including a 1921 Grand Prix Sunbeam. His son, Donald Campbell, carried on the family tradition by holding both land speed and water speed records.
Coniston Water in the English county of Cumbria is the third-largest lake in the Lake District by volume, and the fifth-largest by area. It is five miles long by half a mile wide, has a maximum depth of 184 feet (56 m), and covers an area of 1.89 square miles (4.9 km2). The lake has an elevation of 143 feet (44 m) above sea level. It drains to the sea via the River Crake.
A hydroplane is a fast motorboat, where the hull shape is such that at speed, the weight of the boat is supported by planing forces, rather than simple buoyancy.
Hydroplane racing is a sport involving racing hydroplanes on lakes and rivers. It is a popular spectator sport in several countries.
A motorboat, speedboat or powerboat is a boat that is exclusively powered by an engine.
The world unlimited Water Speed Record is the officially recognised fastest speed achieved by a water-borne vehicle, irrespective of propulsion method. The current unlimited record is 511.11 km/h (317.59 mph), achieved by Australian Ken Warby in the Spirit of Australia in 1978.
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Bluebird K7 is a jet engined hydroplane which Britain's Donald Campbell set seven world water speed records between 1955 and 1967. K7 was the first successful jet-powered hydroplane, and was considered revolutionary when launched in January 1955. Campbell and K7 were responsible for adding almost 100 miles per hour (160 km/h) to the water speed record, taking it from existing mark of 178 miles per hour (286 km/h) to just over 276 miles per hour (444 km/h). Donald Campbell was killed in an accident with a much modified K7, on 4 January 1967, whilst making a bid for his eighth water speed record, with his aim to raise the record to over 300 miles per hour (480 km/h) on Coniston Water.
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