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).
Location and potential issues with the 40/50 HP torque arm and hydraulic damper.
| Identifier | ExFiles\Box 65\4\ scan0054 | |
| Date | 13th December 1926 | |
| To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to EY. c. to EY/HEB.{H. Biraben} [Handwritten]: X8005 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}7/LG13.12.26. 40/50 HP. TORQUE ARM LOCATION. [Handwritten]: X8005 / X7005 With reference to the position of the hydraulic damper to prevent quarreling with the torque arm under spring deflection. Herewith the result of the test we have carried out. We have done this both on the present 40/50 and on EAC-Vll, however, we are only sending that for the 40/50 as we imagine the dimensions of the torque arm may be altered for the other chassis. Actually on EAC-Vll, if we work with the same relative position of the shock absorber and axle, we can barely appreciate the difference occasioned by the alteration to the road spring. We should like to point out that the end of the torque arm does not move in the arc of the circle and therefore there will always be some quarreling. Also results vary slightly on different cars due to the somewhat peculiar set which the front springs take when they have been in use for a considerable time on our present front wheel brake cars. In the torque arms that we have tried here we allowed sufficient longitudinal flexibility for about 3º axle movement under maximum braking torque. This prevented any serious quarreling and also ensured that the steering did not dive on corners. We wonder whether it is possible to arrange [Handwritten insert: FOR] the ball to have a small amount of cushion movement longitudinally while being rigid [Text struck through: vertically] [Handwritten insert: to transmit] the shock absorber loading. We consider that this would obviate the possibility of the front springing being affected by the torque arm. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||