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).
Summary of test results comparing the stiffness ratings of different steering gear systems.
| Identifier | ExFiles\Box 95\1\ scan0349 | |
| Date | 9th September 1936 | |
| -3- Steering Gear Alone. Rating at Ball Pin - Steering wheel held rigidly La{L. A. Archer} Salle gear. 9" lever. 1315 lbs/in. Standard prod. Ph.III 7" lever. 3120 lbs/in. Ph.III with old needle bearing rockershaft. 7" lever. 2630 lbs/in. Old standard 25 HP. worm and nut steering. 8.25" lever. 1490 lbs/in. Same gear with 8.00" lever as standard on Bentley. 1665 lbs/in. Overall Stiffness of Steering System. Rating at Road Wheels. Standard Ph.III. No spring movement in rear s.s. tube joint. 1850 lbs/ins/degree. La{L. A. Archer} Salle gear in 30-EX. 930 lbs/ins/degree. All production Ph.III with 0.200" s.s. tube spring movement and no set-up load. 720 lbs/ins/degree up to limit of spring movement. 1850 lbs/ins/degree beyond this limit. We give below a summary of our conclusions from the results of these tests. | ||