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 for a new front spring rear anchorage, detailing component breakages over time.
| Identifier | ExFiles\Box 73\2\ scan0311 | |
| Date | 4th April 1924 guessed | |
| BUMP TEST OF NEW SCHEME OF FRONT SPRINGS REAR ANCHORAGE (N.SCH.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 3/8" 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 springs 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. 37 43 | K.5422 | 7 45 | Front clip of rear side front spring broken. contd:- | ||