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:
| Boat | Driver | ||
|---|---|---|---|
| K1 | .jpg)  | Miss England III | Henry Segrave Kaye Don | 
| K2 |   | Miss Britain III | Hubert Scott-Paine | 
| K3 |   | Blue Bird K3 | Malcolm Campbell | 
| K4 | .jpg)  | Blue Bird K4 renamed Bluebird K4 | Malcolm Campbell Donald Campbell | 
| K5 | White Hawk | Frank Hanning-Lee | |
| K6 | Crusader | John Cobb | |
| K7 |   | Bluebird K7 | Donald Campbell | 
| K8 | British Pursuit | Tony Fahey |