Lloyd's unlimited rating

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.

[1] The group has included:

K7 badge, as applied to Bluebird K7