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- Q4928877 subject Q8303261.
- Q4928877 subject Q8529524.
- Q4928877 subject Q8565887.
- Q4928877 subject Q8909995.
- Q4928877 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.".
- Q4928877 thumbnail Blue_Bird_K4_(drawing).png?width=300.
- Q4928877 wikiPageExternalLink malcolm_campbell_and_bluebird_K4.jpg.
- Q4928877 wikiPageExternalLink www.lakelandmotormuseum.co.uk.
- Q4928877 wikiPageWikiLink Q1050411.
- Q4928877 wikiPageWikiLink Q1126099.
- Q4928877 wikiPageWikiLink Q122714.
- Q4928877 wikiPageWikiLink Q1420845.
- Q4928877 wikiPageWikiLink Q1477280.
- Q4928877 wikiPageWikiLink Q362.
- Q4928877 wikiPageWikiLink Q3859083.
- Q4928877 wikiPageWikiLink Q406790.
- Q4928877 wikiPageWikiLink Q4839557.
- Q4928877 wikiPageWikiLink Q4928878.
- Q4928877 wikiPageWikiLink Q4930252.
- Q4928877 wikiPageWikiLink Q582062.
- Q4928877 wikiPageWikiLink Q621028.
- Q4928877 wikiPageWikiLink Q622416.
- Q4928877 wikiPageWikiLink Q6478815.
- Q4928877 wikiPageWikiLink Q6662237.
- Q4928877 wikiPageWikiLink Q7942030.
- Q4928877 wikiPageWikiLink Q8303261.
- Q4928877 wikiPageWikiLink Q8529524.
- Q4928877 wikiPageWikiLink Q8565887.
- Q4928877 wikiPageWikiLink Q8909995.
- Q4928877 wikiPageWikiLink Q971150.
- Q4928877 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.".
- Q4928877 label "Blue Bird K4".
- Q4928877 depiction Blue_Bird_K4_(drawing).png.