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 the weight for vehicle 4.EX with two passengers, detailing front, rear, and total weights.
| Identifier | ExFiles\Box 3\2\ 02-page086 | |
| Date | 24th September 1920 | |
| X 200 2Y.9.20 X. 3764a. WEIGHT OF 4.EX. X.200. WITH TWO PASSENGERS. tons. cwts. qrs. Front. 1 1 3 Rear 1 5 3 _____________________ 2 7 2 Total. | ||