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).
Poor manufacturing and potential improvements for front springs on the Phantom and 20 HP models.
| Identifier | ExFiles\Box 41\1\ Scan047 | |
| Date | 23th September 1925 | |
| To Hs.{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design} c. to CJ. c. to BY.{R.W. Bailey - Chief Engineer} X3803 DA{Bernard Day - Chassis Design}4/M23.9.25. FRONT SPRINGS. X.5410 X.3803 X.8410 X.3900 Referring to the front springs for both the Phantom and the 20 HP. and to the possibility of improving their life, either the present springs are badly made - that is to say - the heat treatment is wrong, or the surface of the plates is wrong, or else the springs should be made with thinner plates, resulting in heavier springs and less stress. In connection with this we may say that we have continuously dropped the stress recently, and though there has been an improvement, it is not as much as one would expect from the amount of drop. The American springs have slightly less steel in them (in proportion to the work done) than the front springs we are now using. It is suggested therefore that the question of the manufacture of the springs should be gone into further. Could we compare our springs with an equivalent set of Lemoine springs? (i.e. as regards weight of steel, number and thickness of plates, etc.) DA.{Bernard Day - Chassis Design} | ||