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).
Comparison report on vibration and noise issues between vehicles 129-GN and 58-GN.
| Identifier | ExFiles\Box 18\3\ Scan155 | |
| Date | 10th September 1930 | |
| To [crossed out] from Wor.{Arthur Wormald - General Works Manager} Copy to [crossed out] HS.{Lord Ernest Hives - Chair} Y2960 Wor{Arthur Wormald - General Works Manager}2/T.10.9.30. IMPRESSIONS OF 129-GN AS COMPARED WITH 58-GN. ------------------------------------------- After driving both cars and riding in the Front and back of both cars, my impressions are that 129-GN is disagreeable and not fit for a Demonstration car. I formed an opinion that 129-GN had a vibration accompanied by other noises under the scuttle and associated with the instrument board. This vibration and noise was disagreeable at a speed (by the speedometer) of 15 to 22 miles. This is quite a short period compared with the vibration on 58-GN. The vibration on 58-GN seems to start about 14 miles per hour and continues to 29 or 30 miles per hour. It does not appear, however, so disagreeable as 129-GN, because the vibration seems flattened out over a longer range and is less intense in consequence, that is to say - 129-GN reaches a peak of vibration quicker. As to the actual vibration, there is little to choose in the two cars, but I think, owing to 129-GN reaching its period more quickly and being accompanied by other noises around the scuttle and instrument board, causes it to be much more disagreeable and altogether unsuitable. Another strange feature of the two cars is, that 129-GN seems to be far more noisy on setts than 58-GN, in spite of the fact that 58-GN has disc wheels. This may have something to do with the rear axle, because I formed an opinion that the axle on 129-GN was noisy in comparison with 58-GN, particularly at a speed of 30 miles per hour. There is a badly fitted lamp on the wing of 129-GN. Also there is a bad body noise on 58-GN. Our best efforts should be made to eliminate the noise around the scuttle and the instrument board on 129-GN before we proceed with the vibration noise. I drove both cars and rode in the back of both cars, and my opinion is that 129-GN is more disagreeable than 58-GN. Further investigation is proceeding. Since writing the above, we have found the cause of the rattle on 58-GN. This was found to be due to a faulty fastener on the hinge panel cover for hood extension, this has now been rectified. Referring to PN{Mr Northey}2/WT9.9.30, this is of course, understood, and Hs.{Lord Ernest Hives - Chair} is giving his attention to 58-GN. Wor.{Arthur Wormald - General Works Manager} | ||