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).
Specification comparison between two models, W.M.B. 11 and S.B.50.
| Identifier | ExFiles\Box 144\4\ scan0168 | |
| Date | 26th November 1940 | |
| Rm.{William Robotham - Chief Engineer}7/ML.26.11.40. W.M.B. 11. S.B.50. Engine size 4¼ litres 4¼ litres Engine Type Aluminium Cast Iron Conventional Novel Wheel base 11 ft. 4 ins. 10 ft. 10 ins. Weight 41¼ cwt. 39 cwt. Lap speed 76 m.p.h. 85 m.p.h. Axle ratio 8 X 34 11 X 41 Consumption 15 16 (Approx:) Compression 6.5 6.25 Ratio Reduced Cost. Improved Durability. Greater Fuel Economy. Improved Performance. | ||