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 from a bump test on a 40/50 HP model, detailing component failures and replacements over time.
| Identifier | WestWitteringFiles\K\November1923\ Scan81 | |
| Date | 26th November 1923 | |
| BUMP TEST - 40/50 HP. New scheme of Front Axle and Brakes (C.71030), Steering (C.71205) Radius Rods (N.S.1469, Springs and Fittings (N.S.1409), Side Steering Tube (F.70666). Drum = 105 R.P.M. Tyres = 65 lbs./sq.in. Cams = 2" lift. Load = 600 lbs. plus top half Crankcase and full Radiator. Loads of original springs - N.S. 1185 lbs. O.S. 1268 lbs. Total running time. | Running Time. | Piece No. | PARTICULARS hrs.mins. | hrs. mins. | --- | --- | --- | --- 8 57 | 8 57 | F.4636 | Near side front spring (Woodhead) Top leaf broken in two places - 1" forward and 2 1/2" to rear of centre bolt. Both front springs replaced by Firths (Loads 900 lbs. & 950 lbs.) 14 57 | 6 0 | F.70327 | Near side front spring (Firth) Top leaf broken 2" forward of centre bolt. Replaced by Firth spring (Load 950 lbs.) 17 30 | 17 30 | F.6985 | Steering Column Tube broken at lug connecting same to steering gear box. 17 30 | | F.2871 | Cross member steering column clip broken. 17 45 | 17 45 | F.70545 | Steering Pendulum Arm broken 2" from ball-joint end. 19 40 | 10 43 | F.70328 | Off side front spring (Firth) top leaf broken 9 1/2" to rear of centre bolt. Replace by Firth spring (Load 950 lbs.) 24 22 | 24 22 | F.70504 | Buffer spring broken in rear joint of side steering tube. 24 41 | 24 41 | F.9702 | Steering rocker shaft arms broken at point of junction of arms to shaft proper. CONTD:- | ||