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 sheet detailing the springing characteristics for the 40/50 HP model.
| Identifier | ExFiles\Box 17\1\ Scan025 | |
| Date | 22th April 1931 guessed | |
| SPRINGING CHARACTERISTICS 40/50 RR. FRONT AXLE. REAR AXLE. SPRUNG WT. COMPLETE CAR. 2053. 2327. UNSPRUNG WT. 407. 687. The front spring rating varies from 500 lbs/1" to 245 lbs/1". The rear spring rating varies from 210 lbs/1" to 125 lbs/1". The wide variation in the rating of the springs fitted is accounted for by the fact that individual customers receive special treatment and cars are sprung between the two extremes of town carriages and continental speed cars. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||