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).
Calculation of extra weight on chassis 1750 caused by using 'fleumatic' in tyres.
| Identifier | ExFiles\Box 3\3\ 03-page029 | |
| Date | 31th October 1911 | |
| 31/10/11 Extra Weight caused by using fleumatic in tyres. Chassis 1750 front 17 . 0 . 7 . rear 13 . 0 . 14 ________________ 30 . 0 . 21 all complete 30 . 0 . 21 3 . 14 ________________ 31 . 0 . 7 with petrol OVER | ||