Derek Kelsall
| Boat type | Design Year | Category |
|---|---|---|
| K 26 | ? | Trimaran |
| K-39 S.R. | ? | Trimaran |
| Tonga 40 S. R. | ? | Catamaran |
| Tonga Lima 31 | ? | Catamaran |
Naval Architects
| Boat type | Design Year | Category |
|---|---|---|
| K 26 | ? | Trimaran |
| K-39 S.R. | ? | Trimaran |
| Tonga 40 S. R. | ? | Catamaran |
| Tonga Lima 31 | ? | Catamaran |