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 report on a front bumper chassis, logging running hours and component failures.
| Identifier | ExFiles\Box 54\3\ Scan021 | |
| Date | 12th July 1921 | |
| W/S {Derby Works / Sales} X2628 REPORT ON BUMPER CHASSIS - FRONT. Special fittings fitted. Radiator - Monel metal plates and copper tubes. Rocker shaft on steering X.3920 F.8956 D. {John DeLooze - Company Secretary} type. Support bracket E.20246 X.4373. New Frame with fittings off previous frame. Date. | Total hrs. run | Remarks. -------------------------------------------------------------------------------------------------- 12.7.21 | 3 hrs. | 13.7.21 | 5 hrs. 30 mins. | Bottom leaf O.S. spring broken. | 6 hrs. 40 " | 2nd. leaf from bottom O.S. broken. | 7 hrs. | 3rd. and 4th. leaves from bottom O.S. broken. 14.7.21 | 11 hrs. 50 " | Old spring fitted to O.S. returned with 4.EX. 15.7.21 | 15 hrs. 35 " | 5, 6 and 8 leaves N.S. spring broken - new leaves fitted. 16.7.21 | 18 " 20 " | O.K. 18.7.21 | 22 " 45 " | Top leaf N.S. spring broken 4th. leaf broken. | 23 " 45 " | O.K. 19.7.21 | 31 " 50 " | O.K. 20.7.21 | 33 " 15 " | 1, 3, 4, 5, 6, 7 N.S. leaves broken New leaves fitted. 21.7.21 | 39 " 5 " | U.S.A. front springs taken off 4.EX fitted. N.S. and O.S. F.4633. O.K. 22.7.21 | 44 " 5 " | O.K. Tyre trouble. 4.8.21 | 49 " 35 " | O.K. 5.8.21 | 56 " 35 " | Top leaf N.S. spring broken centre. 23 hrs. 20 mins. 8.8.21 | 59 " 15 " | 2nd. and 3rd. leaves N.S. spring broken. 26 hrs. 8.8.21 | 61 " 15 " | O.K. 9.8.21 | 63 " 35 " | 7, 8 and 9 leaves N.S. spring broken. 28 hrs. 20 mins. contd:- R.R. 516A (T) 1000 11/20 (S) L (E-S) 11-10-20/21 008S | ||