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- Blue_Bird_K4 abstract "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.K4 was built by Vosper & Company as a replacement to the 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 a 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 Bluebird K7.K4 set one world water speed record on 19 August 1939 on Coniston Water, Cumbria, England.".
- Blue_Bird_K4 wikiPageExternalLink www.lakelandmotormuseum.co.uk.
- Blue_Bird_K4 wikiPageExternalLink malcolm_campbell_and_bluebird_K4.jpg.
- Blue_Bird_K4 wikiPageID "16489459".
- Blue_Bird_K4 wikiPageRevisionID "580294549".
- Blue_Bird_K4 hasPhotoCollection Blue_Bird_K4.
- Blue_Bird_K4 subject Category:Bluebird_record-breaking_vehicles.
- Blue_Bird_K4 subject Category:Hydroplanes.
- Blue_Bird_K4 subject Category:Jet-powered_hydroplanes.
- Blue_Bird_K4 subject Category:Water_speed_records.
- Blue_Bird_K4 comment "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.K4 was built by Vosper & Company as a replacement to the 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.".
- Blue_Bird_K4 label "Blue Bird K4".
- Blue_Bird_K4 label "Bluebird K4".
- Blue_Bird_K4 sameAs Bluebird_K4.
- Blue_Bird_K4 sameAs m.03y8kf2.
- Blue_Bird_K4 sameAs Q4928877.
- Blue_Bird_K4 sameAs Q4928877.
- Blue_Bird_K4 wasDerivedFrom Blue_Bird_K4?oldid=580294549.
- Blue_Bird_K4 isPrimaryTopicOf Blue_Bird_K4.