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).
Bumping tests for Firths 12.5% thin leaf front springs.
| Identifier | ExFiles\Box 52\2\ Scan112 | |
| Date | 21th November 1924 | |
| R.R. 493A (20H) (D.A. 652 20-3-24) J.R.D. EXPERIMENTAL REPORT. Run 29 Expl. No. 1331 2528 REF: Hs {Lord Ernest Hives - Chair} 4/LG21.11.24. To R. {Sir Henry Royce} from Hs. {Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG. {Mr Rowledge} E. {Mr Elliott - Chief Engineer} c. to DA. {Bernard Day - Chassis Design} EY. c. to Wor. {Arthur Wormald - General Works Manager} BUMPING TESTS ON FIRTHS 12½% THIN LEAF FRONT SPRINGS. We are carrying out tests on the latest Firths 12½% thin leaf front springs. With these springs, Messrs. Firths were given a free hand as regards thickness and camber of plates. The results so far shew a very definite improve-ment over any front springs we have previously tested. One spring has run 45 hrs. before the top leaf failed. When the spring was dismantled it was found that the bottom leaf and the fifth from the top were broken. On another spring, the top leaf lasted for 31 hrs. The bottom leaf on this same spring failed at 22½ hrs. Further springs are being tested. These springs give promise of excellent results. Hs. {Lord Ernest Hives - Chair} | ||