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).
Alterations to the front springing, braking servo, and axle design for specific car models.
| Identifier | ExFiles\Box 72\3\ scan0036 | |
| Date | 24th July 1924 | |
| To Hs{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} c. to CJ & BJ. f9410 SECRET. E.A.C.3. R2/M24.7.24. X.9421.X.9940 X.9410 X.9420 Regarding the springing of these cars it will be noticed that no change is proposed to the rear of the car, the alteration to the front of the car being that the springs will be arranged about 12% stiffer than our present standard. They will contain little more steel than the present standard as it is assumed that there will be a little alteration to the thickness of the plates, and probably one extra plate will be fitted. Owing to their being 12% stiffer they will have approximately 12% less initial camber so that the relative position of the axle and the frame will be the same under normal load as at present. It is proposed to fit slightly thicker rubber buffers to protect the springs on the bump and to make the bump less severe. It will be understood also that these springs are those of uneven length, being 22½" at the back, and 21" at the front. It is assumed also that the front braking will be reduced this same 12%. This will necessitate altering the servo 12% by increasing the dia. of the face cam the same amount, and keeping the angle of the teeth as at present which I understand is 55°. In the first deliveries of EAC.3 no radius rods will be fitted, but as regards EAC.2 it is proposed that these axles shall be forged with the necessary boss to receive the radius rod and that the bracket for the rear end of the front spring shall be modified so as to take (1) the spring, (2) the radius rod, and (3) the tie rod all in the same fitting, the drawings for this being in hand. R.{Sir Henry Royce} | ||