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).
Modifications to the front springs on a 12-MC chassis to improve ride comfort and reduce 'joggle'.
| Identifier | ExFiles\Box 43\2\ Scan114 | |
| Date | 20th April 1926 | |
| Oy1-E-42026 [Handwritten:] Mr Hives to note please and return [Stamped:] RECEIVED 28 APR April 20th, 1926 [Handwritten:] ap 29/26 To: Mr. Beaver Mr. Nadin (England) Mr. Bagnall Mr. Hulley Mr. Caswell Mr. Southern Mr. Burton Mr. Knapton From: Mr. Olley Front Springs on 12-MC The front springs for this car had been worked out to a stiffness (clipped to axle) of 340 lbs./in. corresponding to our present standard 3-1/2" deflection. With this change combined with the vertical front shackle (which had been found a marked improvement on the earlier and stiffer springs) the riding of the car had been improved until it was within the general range of typical Silver Ghost comfort, but not equal to a really well spring and well adjusted Silver Ghost. A number of rides were taken with different passengers, and all noticed the improvement, within a few miles and remarked that it was still not as good as we could do on the Silver Ghost. The ride to Boston and back last Monday was very convincing. Every arrangement of front and rear shock absorbers was tried, and it was found that our standard adjustment front and rear was as good as any. A light rear setting however minimised the "joggle" at the rear. Test 1. We were still worried by the same rather high frequency "joggle" in the back (about 250 - 300 a minute) which we found by elimination was present in the body and chassis, but was exaggerated by the seat cushions. It is thought that by putting in our latest seat cushions the effect can be reduced and we intend to try this later. The same effect is present in all our cars but to a much less degree. Inspection of the tie rods showed that they were under distinct tension, as they should be. | ||