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).
Blueprint diagram of the Plymouth engine's front and rear mounting system.
| Identifier | ExFiles\Box 128\1\ scan0115 | |
| Date | 31th October 1931 guessed | |
| PLYMOUTH ENGINE FRONT MOUNTING THIS PORTION IS FIXED TO THE CHASSIS C CENTRE OF GRAVITY B CENTER OF GRAVITY STABILIZING SPRING PLYMOUTH ENGINE REAR MOUNTING | ||