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 characteristics for different Phantom chassis series.
| Identifier | ExFiles\Box 67\4\ scan0257 | |
| Date | 2nd February 1927 guessed | |
| PHANTOM CHASSIS. STEERING. [Table Data] Row 1: TYPE OF CHASSIS AND STEERING.: B.2 series.++ 9.500 pendulum lever. Angular mvt. of stg. wheel due to drop of axle on full rebound assuming solid s.s. tube.: Nil. Linear mvt. of pendulum lever ball pin.: --- Max: dfln. of s.s. tube spring.: --- Force necessary at rim of stg. wheel to hold pendulum lever stationary and allow s.s. spring to absorb the mvt.: XX Angular mvt. of the stg. wheel after the s.s. tube spring has been compressed to the stop.: --- Force at rim of wheel to allow springs to absorb movement of ball due to 1.500 axle rebound.: 5.3 lbs. Remaining angular mvt. of wheel.: Nil. Row 2: TYPE OF CHASSIS AND STEERING.: C.2. series. 11.000 pendulum lever. Angular mvt. of stg. wheel due to drop of axle on full rebound assuming solid s.s. tube.: 15º Linear mvt. of pendulum lever ball pin.: .150 Max: dfln. of s.s. tube spring.: .400 (.200 each end.) Force necessary at rim of stg. wheel to hold pendulum lever stationary and allow s.s. spring to absorb the mvt.: 15.9 lbs. Angular mvt. of the stg. wheel after the s.s. tube spring has been compressed to the stop.: Nil. Force at rim of wheel to allow springs to absorb movement of ball due to 1.500 axle rebound.: 5.3 lbs. Remaining angular mvt. of wheel.: Nil. [Notes] Note XX - The results in this column are based on a 100% mech: efficiency gear - therefore adjustment must be made to suit conditions. Note that full rebound on B2. No deflection occurs but at 1.5 rebound the point is on the arc b-c and [strikethrough] deflection is produced. For B2. series chassis with 9.500 pendulum lever, X & Y are equal i.e. Δ abc is isosceles & no movement occurs at a.{Mr Adams} [Diagram Labels] f++, a, b, c, x, y | ||