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 with calculations for a balance weight for model LeC 2925.
| Identifier | WestWitteringFiles\W\May1931-August1931\ Scan090 | |
| Date | 1st August 1931 guessed | |
| 1 1/4" THICK 13.0" 4.6 lbs MOMENT 11.5 lbs-ins INERTIA = M/2 (a² + x²) 2.3 (3.5 + 16) = 45 lbs-in² BALANCE WEIGHT FOR LeC 2925 | ||