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 the results of a bump test on a new front axle and brake system.
| Identifier | ExFiles\Box 73\2\ scan0169 | |
| Date | 2nd January 1924 | |
| SHEET 1. BUMP TEST ON NEW SCHEME OF FRONT AXLE AND BRAKES, ETC. Conditions of test :- Drum makes 105 r.p.m. Lift of Cam 2". Tyres at 65 lbs/sq.in. Load 600 lbs. plus top half of Crankcase and full Radiator. Front Axle & Brakes C.71030 - Steering C.71205 - Side Steering Tube E.70666 - Radius Rods N.Sch.1469 - Springs & Fittings N.sch.1469 - Pugeot Shock Absorbers. Total running time. hrs.mins. | Piece No. | Running time. hrs.mins. | BREAKAGES. Description and Remarks. 8 57 | F.4636 | 8 57 | N.S. front spring top leaf broken in two places - 1" to front and 2½" to rear of centre bolt. Both front springs replaced by Firths. 14 57 | F.70327 Firths | 6 0 | N.S. front spring top leaf broken 2" forward of centre bolt. Replaced by Firths spring. 17 30 | F.6985 | 17 30 | Steering column outside tube broken at lug connecting same to steering gearbox. 17 30 | F.2871 | 17 30 | Cross Member Steering Column clip broken. 17 45 | F.70545 | 17 45 | Steering pendulum broken 2" from ball joint end. 19 40 | F.70328 Firths | 10 43 | O.S. front spring top leaf broken 9½" to rear of centre bolt. Replaced by Firth spring. 24 41 | F.9702 | 24 41 | Steering rocker shaft arms broken off. 27 35 | F.70328 Firths. | 12 38 | N.S. front spring top leaf broken 7" from rear shackle. New Woodhead top leaf fitted. 32 37 | F.70545 | 14 52 | Steering pendulum broken into rocker shaft hole. | ||