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).
Bump test report on a new scheme for front springs and rear anchorage, detailing breakages over time.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan97 | |
| Date | 1st April 1924 guessed | |
| BUMP TEST OF NEW SCHEME OF FRONT SPRINGS REAR ANCHORAGE (N.REF. 1706). Conditions of test :- Drum = 105 r.p.m. Cams. = 2" lift. Tyres = 65 lbs./sq.in. Load = 600 lbs. + top half crankcase and full radiator. | Total running time. Hrs.mins. | Piece No. | RUNNING time. hrs. mins. | BREAKAGES. Description and remarks. | |---|---|---|---| | 14 0 | F.71005 | 14 0 | N.S. front spring (Firth 1050 lbs.) top leaf broken 2" to rear of centre bolt. | | | F.71005 | 14 0 | O.S. front spring (Firth 1050 lbs.) top leaf broken 2" to front of centre bolt. | | | | 14 0 | Brazed joint given way at junction of steering column and lug attached to steering box. | | 15 5 | | 15 5 | Front 3/4" bolt sheared in O.S. front tie-rod anchorage. | | 16 15 | F.2888 | 16 15 | N.S. flange of 3rd. cross member cracked through. | | 18 53 | K.5422 | 18 53 | Front clip of N.S. front spring broken. | | 24 40 | F.7387 | 24 40 | N.S. frame member cracked 3" to rear of front spring rear anchorage. | | | F.4614 | 24 40 | Front buffer spring in rear joint side steering tube broken. | | | F.4614 | 24 40 | Rear buffer spring in rear joint side steering tube broken. | | | F.1328 | 24 40 | N.S. bracket of 5th. cross member broken. | | | F.1328 | 24 40 | O.S. bracket of 5th. cross member broken. | | 25 53 | K.5422 | 25 53 | Rear clip of O.S. front spring broken. | | | F.7250 | 25 53 | O.S. front spring pad broken. | | | F.2888 | still running. | Crack started in N.S. flange of 3rd. cross member. | | 29 58 | K.5422 | 11 5 | Front clip of N.S. front spring broken. | contd:- | ||