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).
Table of test results for the 20 HP chassis steering system under various configurations and components.
| Identifier | ExFiles\Box 106\3\ scan0141 | |
| 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 has 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 F51864 Rate 375. | 28° | .400 (To front of chassis.) | .500 | 19 lbs. | Nil | 7.125 lbs. | 17.5° | 3.56 lbs. | Nil | | Conversion tube. Spring F.54759. Rate 600. | 28° | .400 | .400 | 23.6 lbs. | Nil | 8.85 lbs. | 17.5° | 4.4 lbs. | Nil | | **Inside pendulum lever with F.W.B.** | | | | | | | | | | | Original tube. Spring F.51863 Rate 1153. | 35° | .575 (To rear of chassis.) | .150 | Spring against stop. 21.4 lbs. | 26° | 21.4 lbs. | 26° | 21.4 lbs. | 2.3° | | Conversion tube. Spring F.54759 Rate 600 | 35° | .575 (To rear) | .400 | Spring against stop. 24.1 lbs. | 10.5° | 9 lbs. | 25.8° | 11.3 lbs. | Nil | | **Outside pendulum lever. With F.W.B.** | | | | | | | | | | | Chassis 151 to 200 in 'J' series. Spring F.53918 Rate 1100 | 38° | .500 (To rear) | .150 | Spring against stop. 20.86 lbs. | 26° | 20.86 lbs. | 26° | 20.88 lbs. | 3.66° | | 'K'series. F.54759 Rate 600 | 38° | .500 (To rear) | .400 | Spring against stop. 22.2 lbs. | 7.5° | 8.3 lbs. | 26.6° | 11.1 lbs. | Nil | | ||