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 showing a modification to the front undershield to improve the cooling system.
| Identifier | ExFiles\Box 29\3\ Scan215 | |
| Date | 2nd July 1930 guessed | |
| MODIFICATION TO IMPROVE COOLING SYSTEM. CUT AWAY FRONT UNDERSHIELD STANDARD FRONT UNDERSHIELD | ||