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).
Sketch of the Front Axle Yokes showing differences due to altering the caster angle.
| Identifier | ExFiles\Box 114\1\ scan0319 | |
| Date | 7th November 1940 guessed | |
| A = 3/4° CASTER ANGLE. FB 4142/3 B = 1 1/2° CASTER ANGLE. GB 5356/7 FB 4142 & GB 5356 USE SAME FORGING FB 4108. FB 4143 & GB 5357 USE SAME FORGING FB 4109. VIEW AT RIGHT ANGLES TO WISHBONE AXIS VIEW IN LINE WITH WISHBONE AXIS ℄ OF BOTTOM BOSS VERTICAL ℄ 1.793 ±3 A.{Mr Adams} 0° 0' B. 1° 20' ℄ OF HOLE INCLINED AT THIS ANGLE ℄ OF BOTTOM BOSS 2.588 ±5 A.{Mr Adams} 3° 47' B. 3° 14' ℄ OF HOLE INCLINED AT THIS ANGLE OUT OF CENTRE POINT DISTANCE 2.42" USED ON 3-B-50 SCALE FULL SIZE FRONT AXLE YOKES SKETCH SHEWING DIFFERENCES DUE TO ALTERING CASTER ANGLE SKETCH SHEWS LEFT HAND YOKE | ||