Lloyd's unlimited rating
{{Short description|Hydroplane speed 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.{{cite book
|title=The Bluebird Years
|last=Knowles |first=Arthur
|publisher=Sigma Leisure
|year=2001
|isbn=978-1-85058-766-8
}}
The group has included:
| class="wikitable sortable"
!width="*"| !width="*"| !width="*"|Boat !width="*"|Driver |
| K1 |
| K2
|Hubert Scott-Paine |
| K3 |
| K4
|Blue Bird K4 |
| K5
| |
| K6
| |
| K7 |
| K8
| |Tony Fahey |
