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 failures on a 40/50 Bumper Chassis Front over running hours.
| Identifier | ExFiles\Box 119\2\ scan0159 | |
| Date | 10th December 1920 | |
| 40/50 CHASSIS. BUMPER CHASSIS - FRONT. Special fittings fitted. Radiator - Monel metal plates and copper tubes. Rocker shaft on Steering F.8956 - D.{John DeLooze - Company Secretary} type. (X.3920) Support bracket E.20246 (X.4373) New Frame with fittings off previous frame. Total hrs. run. | Remarks. 5 hrs. 30 mins. | Bottom leaf O.S. spring broken. 6 " 40 " | 2nd. leaf from bottom O.S. broken. 7 " 0 " | 3rd. and 4th. leaves from bottom O.S. broken. 15 " 35 " | 5, 6 and 8 leaves N.S. spring broken. 22 " 45 " | Top leaf N.S. spring broken - 4th. leaf broken. 33 " 15 " | 1, 3, 4, 5, 6, 7 N.S. leaves broken. 56 " 35 " | Top leaf N.S. spring broken centre. 59 " 15 " | 2nd. and 3rd. leaves N.S. spring broken. 63 " 35 " | 7, 8 and 9 leaves N.S. spring broken. 70 " 10 " | Centre bolt broken N.S. spring. 81 " 21 " | Centre bolt broken N.S. spring. 89 " 56 " | Top leaf O.S. spring broken (U.S.A.) 91 " 11 " | 6, 7 and 8 leaves broken - 9th. cracked O.S. spring. Frame cracked at N.S. front cross member bolt holes. 94 " 36 " | 2, 12 and 13 leaves broken O.S. spring. Test finished - Radiator brackets O.K. Radiator fouls brackets where cleared away at bottom for brackets. | ||