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).
Test log detailing the life, running conditions, and failure analysis of vehicle springs.
| Identifier | ExFiles\Box 55\4\ Scan295 | |
| Date | 7th January 1929 guessed | |
| Piece No. | Spring No. | Life. Hrs. Mins. | Running conditions. e.g. Dampers. | Where broken. | Brinell of broken part. F.78797 | 1 | 22 20 | Dampers for first 7½ hrs. only. | Top leaf, 3¼" from rear eye. | 375 " | 2 | 24 35 | As above. | Top leaf, 5¼" from rear eye. | 388 F.78798 | 3 | 16 05 | No dampers. | Top leaf and next to it, both 2" behind centre spring pad clip. | 388 388 " | 4 + | 22 15 | " | Top leaf, 6¼" from rear eye. | 388 " | 5 + | 30 35 | Dampers first 8 hrs. 25 mins. without dampers. Finished with dampers. | Top leaf, 1" behind centre bolt. | 388 " | 6 | 69 25 | With dampers. | Unbroken. | F.79446 | | 100 0 | No dampers for first 57 hrs. 45 mins. | Unbroken. | " | | 100 0 | ditto | Unbroken. Broke at 70 hrs. 25 mins. | F.78798 | 5 + | 15 45 since repair | Dampers fitted. | 1st, 3rd, and 6th. leaves. Top leaf still intact after 15 hrs. 45 mins. running. | " | 4 + | 31 15 since repair. | Dampers fitted. | Unbroken. | [Right Margin, top to bottom] FRONT SPRINGS REAR SPRINGS FRONT SPRINGS REPAIRED. | ||