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).
Shock absorber knocks, design issues, and potential modifications for 40/50 and Phantom models.
| Identifier | ExFiles\Box 68\2\ scan0252 | |
| Date | 7th July 1929 | |
| To Hm.{Capt. W. Hallam - Head Repairs} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} 48520 Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}1/LG2. 7. 29. SHOCK ABSORBER KNOCKS. X8520 /5520 Reference to Depot Sheet Hm.{Capt. W. Hallam - Head Repairs}105. We agree with the recommendations except that we should prefer not to drill the high pressure valve of the 40/50 because in hot weather even the small .032 hole does appreciably affect the efficiency of the damper especially with the higher loading as on the 40/50. We should like to know if the Repair Dept. have failed to cure any 40/50 complaint when they adopted the improved pin fits and side clearance. We should also like to have a brief summary of the complaints which have arisen and been dealt with by the Repair Dept. on shock absorber knocks because we want to impress R.{Sir Henry Royce} with the fact that the design is giving us trouble. R.{Sir Henry Royce} has objected to us drilling the H.P. valve but the only alteration in design that we have been given is an increase in bearing area of the pins from .234 sq. ins. to .281 sq. ins. As the Phantom damper loads are 40% greater than the 20 HP., this 20% increase in pin area would not seem to be adequate for the Phantom if complaints of knocks are being received in any quantity on these cars. The pins with the .281 sq. ins. area are now standard on the 20 HP. car and we should like the R.D. to follow them closely and report on their behaviour. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||