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 of springing arrangements and ride comfort for different car bodies.
| Identifier | ExFiles\Box 106\1\ scan0368 | |
| Date | 17th September 1935 | |
| -2- (3) Dealing with the springing of other cars, the position is that GLG-33, GLG-42, and GLG-78, were types which previous to a recent decision were fitted for various reasons with normal springing. We would agree that for smoothness of riding viz. comfort in the rear seats under touring conditions, low rating springs are desirable, and under these circumstances we should consider that any of these three cars would compare fairly closely with your own, but your own would always have a slight advantage owing to the weight of the body. (4) GLG-23 would appear to be a normal saloon, originally fitted with low rated springs but with a body 2 cwts lighter, and as this was specified as a six seater, the weight of the body is exceptionally small, and therefore some of the weight in question necessary to accommodate the occasional seats is well between the front and rear springs, and therefore is badly arranged weight from the point of view of springing as it reduces the moment of inertia of the body considered as revolving on an axis parallel to the axles, and somewhere between them. This body would definitely ride worse than your own. The springing of this car was exactly to schedule as specified originally, the body however came out 1 cwt lighter from the figures you have given us, which means that our springs were slightly on the stiff side compared with your own, there would be a difference of 3 cwts viz. if we undersprung this car to the same extent as your own, it would have called for springs 3 cwts lighter. We should consider that springs 3 cwts lighter on this car would have slightly improved the riding but the result would still be due to bad weight distribution, and the car would not even then compare with your own for good riding. The riding effect of this car with six passengers would be definitely subject to pitching, and even with the occasional seats being occupied, this effect would still Cont'd.{John DeLooze - Company Secretary} | ||