Test report for a 10-leaf front chassis spring (F.4629), detailing Brinell hardness, test results, and duration.
| Identifier | ExFiles\Box 80\2\ scan0221 | |
| Date | 29th September 1920 | |
| X 2628 X.133/ BUMPER TEST - FRONT CHASSIS. X 2628 Spring F.4629 - 10 leaves, tapered ends with clips, nibs and slots. 900 lbs. Fitted to N.S. Bump Chassis 23.9.20. No. of leaves. | Brinell. | Remarks. | Time run. 1 | 444 | O.K. 2 | 415 | O.K. 3 | 444 | Broken in centre. 4 | 415 | Broken in centre. 5 | 415 | Broken in centre. 6 | 415 | Broken in centre. 7 | 415 | Broken in centre. 8 | 415 | Broken in centre. 9 | 415 | O.K. 10 | 415 | O.K. Time run: 15 hrs. 40 mins. Taken off 29.9.20. Spring F.4629 - standard spring - 10 leaves, nibs and slots, tie clips, tapered ends. 900 lbs. Fitted to N.S. Bump Chassis 29.9.20 - still O.K. | ||
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).