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).
Comparing Firths and Woodhead springs regarding internal friction, digging-in, and other design factors.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan099 | |
| Date | 22th September 1928 guessed | |
| contd :- -2- springs in service so that we shall shortly get a test as to how their internal friction changes compared with standard. Any feature in spring design that would prevent digging-in would be an advantage. Though our road tests have not emphasised rear spring internal friction as being all important, it does seem to be one feature that we can improve without running into difficulti elsewhere. We cannot disregard the opinion of the Repair Dept. who have to satisfy customers. We attach a report from them in which it will be seen that Firths springs give a lot of trouble from digging-in. Woodheads are a great deal better though far from ideal. It would seem to be worth while making Firths who at present supply our springs, follow Woodhead until we know of something better. We attach prints comparing the two types of spring. Possibly the brinell is the controlling factor. We think however that the bedding of both springs could, with advantage, be increased some hundreds per cent and the matter is being taken up with the spring makers. lis/Rn.{Mr Robinson} | ||