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).
Results of a bumping test on 20 HP drilled and grooved road springs.
| Identifier | ExFiles\Box 106\1\ scan0164 | |
| Date | 8th January 1930 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. to Mor. Da.{Bernard Day - Chassis Design} c. to Da.{Bernard Day - Chassis Design} Ey. c. to Sg.{Arthur F. Sidgreaves - MD} X 5410 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}5/MJ.8.1.30. 20 HP. ROAD SPRINGS. We have recently been running a bumping test on the 20 HP. with drilled and grooved road springs. We were rather apprehensive that the 20 HP. front springs, which have always been notoriously short lived on the bump test, might have their failure accentuated by being drilled and grooved. We have, however, on these springs, obtained an average life of over 40 hours (piece No.F55324) which is very much better than anything we have previously obtained. The test was of course run with hydraulic shock absorb-ers, which we know play an important part in increasing spring life. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||