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).
Log sheet detailing a bumper test on a chassis, recording hours run and remarks on component failures.
| Identifier | ExFiles\Box 119\2\ scan0099 | |
| Date | 28th May 1920 | |
| X 1331 BUMPER TEST. 2" cam, 105 R.P.M. Special rear springs - no nibs and slots - ground all over. O.S. F.7790 - Loaded lbs. 2160 N.S. F.7789 - " " 2069. Total hours run on chassis. | Remarks. | Hours run. 13.5.20 | --- | --- 14.5.20 | --- | --- 15.5.20 | Shock Absorber fitted N.S. (Drg.) F.419 Bolt on centre spring (Brkt. F.2406 (O.S.)) | 10 hrs. 5 mins. 17.5.20 | Spring tie clip O.S. - rivet broken (front) | 13 " " 18.5.20 | " " N.S. " " (rear) | 22 " 15 " 19.5.20 | F.419 Bolts on centre spring (bracket F.2406) O.S. | 12 " 40 " 28.5.20 | Nut holding shock absorber case to tank, loose. | 35 " 30 " | O.S. spring top leaf broken. 3rd. 4th. & 5th. leave cracked half way across under spring clip (front). Wearing plate cracked. N.S. Spring 3rd. & 4th. leaves broken under clip top and 5th. leaves cracked. | 35 " 40 " 35 hrs. 40 mins. total hrs. run. Contd. | ||