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).
Front end weight comparison of suspensions for Bentley, Wraith, and Packard models.
| Identifier | ExFiles\Box 10\5\ 05-page013 | |
| Date | 24th April 1936 | |
| K7044 633 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/les.{Ivan A. Leslie} a.{Mr Adams} to Cor. b. to Ry. c. to Ds. Herewith a front end weight comparison of the suspensions of the Bentley, 20/25 HP., Ph.II, Ph.III, Wraith and Packard, with additionally a computed value for a Wraith torsion bar scheme, which is only approximate. The Packard use cast-iron shock absorbers for economy; every other system has aluminium shock absorbers. From a design point of view, therefore, the Packard should be credited with the difference between cast iron and aluminium damper cases. We are not altogether in agreement that the portions of the conventional frame forward of the radiator should be debited to the conventionally sprung system, because for the same road spring rating, an independent suspension of the wishbone type exerts more torque on the frame than conventional springing. Also we have not debited the wishbone scheme with the two pieces of frame which have to stick out forward of the radiator to carry the front wings, pan, bumper bar, etc. On the whole we think the figures given are a fair comparison. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||