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).
Tests comparing the internal friction of front and rear road springs under various conditions.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan110 | |
| Date | 29th September 1928 | |
| Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}/LG29.9.28. FRONT ROAD SPRING FRICTION. We have carried out some tests to determine the internal friction of the 40/50 front road springs. The outstanding points are comparing the front and rear springs :- (1) When the springs are new there is little difference between their respective internal frictions. That of the front spring seems slightly greater if anything : Graph G.{Mr Griffiths - Chief Accountant / Mr Gnapp} present report. Graph A.{Mr Adams} Hs{Lord Ernest Hives - Chair}/RnL/LG8.9.28. (2) After considerable service the rear spring friction seems to increase more than that of the front springs : Graph H.{Arthur M. Hanbury - Head Complaints} present report. Graph D.{John DeLooze - Company Secretary} Hs{Lord Ernest Hives - Chair}/RnL/LG8.9.28. (3) When cleaned and lubrciated after service the front spring friction returns more nearly to its original condition than does the rear spring, again this difference may be due to the digging-in of the rear spring. Graph J.{Mr Johnson W.M.} present report. Graph F.{Mr Friese} previous report. (4) The cadmium plated front spring shews a reduction in internal friction over standard unplated when new. Graphs G.{Mr Griffiths - Chief Accountant / Mr Gnapp} and K.{Mr Kilner} present report. (5) After service a cadmium plated road spring seems to maintain a very constant and reasonably low co-efficient of friction, lower than a spring that has not been plated. Graphs H.{Arthur M. Hanbury - Head Complaints} and L. present report. contd :- | ||