Royal Yachting Association unlimited hydroplane rating is a rating applied to hydroplanes competing for the water speed record, as applied by the RYA. It is usually denoted by a circular white badge on the hull, with an infinity symbol "∞" above the K and number for RYA "unlimited" hydroplane group.
The group has included: BoatDriverK1Miss England IIIHenry SegraveKaye DonK2Miss Britain IIIHubert Scott-PaineK3Blue Bird K3Malcolm CampbellK4Blue Bird K4renamed Bluebird K4Malcolm CampbellDonald CampbellK5White HawkFrank Hanning-LeeK6CrusaderJohn CobbK7Bluebird K7Donald CampbellK8British PursuitTony Fahey
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