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).
Progress report on modifications and outstanding issues with a 20 HP car, model 12-G-4.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan007 | |
| Date | 4th September 1928 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}3/LG4.9.28. 12-G-4 20 HP. CAR. X5770 X50260 4H663 We have now made this car satisfactory with regard to :- (1) SLIPPER DRIVE. We have got the correct proportions of damping friction and driving springs. The lower crankshaft periods which were manifest on the car previously have now been eliminated. (2) RUBBER ENGINE MOUNTING. We have fitted rubbers of the correct rating and set up. This has reduced the engine movement in the frame without bringing up vibrations. (3) SCUTTLE JELLYING. Semi isolation has cured this trouble. (4) PISTONS. We are not yet satisfied with the pistons. They are certainly not as good as those which are fitted to the present std. 20 HP. cars. Further work is being done on these. After comparing the riding and steering of this car with the present standard 20 HP. it is apparent that the front springing is not as good; we still get the shuddering at the front of the car which was complained of when the car was at WW. We have carried out tests in parallel with the standard car to determine exactly what alterations made the difference. | ||