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).
Data table comparing steering characteristics for various configurations of the 20 HP chassis.
| Identifier | ExFiles\Box 67\4\ scan0258 | |
| Date | 2nd February 1927 guessed | |
| 20 HP. CHASSIS. STEERING. XX. The results in this column are based on a 100% mech: efficient gear. Therefore adjustment must be made to suit conditions. | TYPE OF CHASSIS AND STEERING. | | Ang:mvt.of stg.wheel due to drop of axle on full rebound. Assuming solid s.s. tube. | Linear mvt. of pendulum lever ball pin. | Max:Defln. of s.s. tube spring. | Force necessary at rim of steering wheel to hold pendulum lever stationary and allow the s.s. spring to absorb the movement. XX | Ang.mvt. of steering wheel after the s.s. tube spg. has been compressed to the stop. | Force necessary at rim of stg.wheel to hold pend:lever stationary allow the side stg.spring to absorb .150 mvt. XX | Ang.mvt.of stg.wheel after the s.s. tube had been compressed .150. | Force at rim of wheel to allow springs to absorb the mvt.due to 1.500 axle rebound. | Remaining angular movement of wheel. | |---|---|---|---|---|---|---|---|---|---|---| | Inside pendulum lever without F.W.B. | Original tube. Spring F.51864 Rate 375. | 28º | .400 (To front of chassis.) | .500 | 19 lbs. | Nil | 7.125 lbs. | 17.5º | 3.56 lbs. | Nil | | | Conversion tube. Spring F.54759. Rate 600. | 28º | .400 | .400 | 23.6 lbs. | Nil | 8.85 lbs. | 17.5º | 4.4 lbs. | Nil | | Inside pendulum lever with F.W.B. | Original tube. Spring F.51863 Rate 1153. | 35º | .575 (To rear of chassis.) | .150 | Spring against stop. 21.4 lbs. | 26º | 21.4 lbs. | 26º | 21.4 lbs. | 2.3º | | | Conversion tube. Spring F.54759 Rate 600 | 35º | .575 (To rear) | .400 | Spring against stop. 24.1 lbs. | 10.5º | 9 lbs. | 25.8º | 11.3 lbs. | Nil | | Outside pendulum lever. With F.W.B. | Chassis 151 to 200 in 'J' series. Spring F.53918 Rate 1100 | 38º | .500 (To rear) | .150 | Spring against stop. 20.86 lbs. | 26º | 20.86 lbs. | 26º | 20.68 lbs. | 3.66º | | | 'K'series. F.54759 Rate 600 | 38º | .500 (To rear) | .400 | Spring against stop. 22.2 lbs. | 7.5º | 8.3 lbs. | 26.6º | 11.1 lbs. | Nil | | ||