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).
Test report detailing 'dither' trouble, body boom, ventilation, and vibration issues, proposing further experimental investigation.
| Identifier | ExFiles\Box 47\1\ Scan077 | |
| Date | 8th September 1921 guessed | |
| - 3 - We took the opportunity of testing the car with the driver and certainly considered that the springing of the car was very good and did not appear to suffer from the 'dither' trouble. There was an inclination, however, for the back of the car to get stuffy and also the body was inclined to boom. I was able to demonstrate to the driver and to Mr. Norris how certain ventilation could be achieved without objectionable draughts. We also went over the body question with Mr. Norris as to the importance of good fitting floorboards and the absence of holes under the seats so as to avoid fumes getting into the body. Hooper body fitted. The vibrations give one the impression that the Axle does not hold the road, and even though the Shock Absorbers are tightened considerably this does not seem to help matters. It is possible the vibration becomes more pronounced after wear has taken place in the shackles and fixtures for the Axles etc. which slack may counteract the full effect of the Shock Absorbers, and if this is so this vibration may not be so noticeable on new cars as on cars which have run a fair mileage. We consider the feature which we have to tackle is the 'dither' trouble and it is important that this matter should receive our attention experimentally at the Works. We are anxious to obtain a complete car which has this trouble on which we can make experiments. We have tried one or two customers cars in for repair and attention and have been able to appreciate that some do and others do not have this trouble. We are now trying to arrange to use a chassis on test with one of our covered bodies and see if we can reproduce this condition and then ascertain what means there are of curing it. We were hoping to procure a Company's Trials Car on which we can do this, and we shall be glad to receive any suggestions or assistance which can be given in order to tackle this trouble. The following are observations and points which (CONTD | ||