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).
Comparison of steering effort based on transverse pivot inclination for different axle series.
| Identifier | ExFiles\Box 17\3\ Scan101 | |
| Date | 22th September 1926 | |
| Attached to:- TRANSVERSE PIVOT INCLINATION OVERALL STEERING EFFICIENCY ASSUMED AS 60% WHEN CALCULATING LOADS ON THE STEERING WHEEL RIM PIVOT ASSUMED VERTICAL IN LONGITUDINAL ELEVATION TO SIMPLIFY COMPARISON SERIES. | Inclination of king pins. | Pivot lift at centre to full lock. | Resultant effort lifting car. Mean manual load. Centre to full lock. T (No F.W.B) | 5° | .0382 | 3.65 lbs. V (New PhantomCodename for PHANTOM I). | 6° | .0532 | 4.56 lbs. C2 (New axle) | 2° 30' | .015 | 1.15 lbs. Comparison of effect of transverse pivot inclination only, i.e. every axle assumed fitted to a "T" series car so that the car wt. and steering ratio remain a constant :- Type of Axle. | Resultant effort lifting car. Rim of the steering wheel. T (No F.W.B.) | 3.65 lbs. V (New PhantomCodename for PHANTOM I). | 5.13 lbs. C2 (New axle.) | 1.44 lbs. | ||