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).
Front bumper test report detailing Brinell hardness results for an 11-leaf spring.
| Identifier | ExFiles\Box 80\2\ scan0197 | |
| Date | 14th October 1928 | |
| J.F.F RECEIVED OCT 14 1928 2628 X2628 BUMPER TEST - FRONT SPRING F.4625 - 950 lbs. 11 leaves with tie clips also nibs and slots, tapered ends. Fitted on O.S. bump chassis 30.8.20 (standard spring) X1831 No. of leaves. Brinell. Remarks. Time run. 1 415 Broken 6" from rear. 2 444 O.K. 3 444 O.K. 4 415 O.K. 5 415 O.K. 10 hrs. 40 mins. 6 444 O.K. 7 444 O.K. 8 444 O.K. 9 444 O.K. 10 415 O.K. 11 415 O.K. Spring taken off 21.9.20. | ||