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).
The weight of a lightened flywheel and clutch assembly.
| Identifier | ExFiles\Box 3\3\ 03-page117 | |
| Date | 21th October 1907 guessed | |
| No 6 flywheels X200 3700 Weight of -after 2nd lightening flywheel portion 18 lbs. } 31 1/2 lbs total clutch " 13 1/2 " | ||