From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Photograph of the Blue Bird K4 hydroplane on its transport trailer.
| Identifier | ExFiles\Box 174\4\ img025 | |
| Date | 9th December 1939 guessed | |
| On boat roundel: ∞ K4 On cradle plaque: THIS CRADLE MUST BE BLOCKED LEVEL WEIGHT OF BOAT & CRADLE APPROX. 3 3/4 TONS On background building: Austin Reed Club | ||