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).
Comparative table of specifications and prices for the 40/50 model against its competitors.
| Identifier | ExFiles\Box 182\M21\ img029 | |
| Date | 19th September 1922 | |
| 40/50 R-R COMPETITORS. -------- Make. Chassis Price. Bore and Stroke. No. of cylinders. Cubic Capacity. Chassis price per Cubic Inch. Treasury Rating. Price per h.p. Treasury rating. 40/50 Rolls-Royce. £1850. 4½ x 4½ 6 453.3 £4. 1.6. 48.6 £38. 1.4 R-R Long. £1900. 4½ x 4½ 6 453.3 £4. 3.9. 48.6 £39. 1.10 40/50 Napier. £1750/£1850. 4 x 5. 6 377.0 £4.12.0. 38.4 £45. 3.0 * Napier Long. £1734/£1834. 4 x 5 6 377.0 £4.17.3. 38.4 £47.15.2 40 hp Lanchester. x£1895. 4 x 5. 6. 377.0 £5. 0.7. 38.4 £49. 7.0 40 hp Hispano Suiza £2100. 3.9x5.5 6 401.0 £5. 4.8. 37.2 £56. 9.0 45 hp Daimler. £1275. 4 3/8 x 5.1 6 438.0 £2.18.2. 45.0 £28. 6.8 30 hp Daimler. £1000 3 35/64 x 5 7/32 6 303.1 £3. 6.0. 30.1 £33. 4.5 x Allowance has been made for accessories that they include and we do not. | ||