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).
Chassis spring failures, detailing life, fracture points, and material tests.
| Identifier | ExFiles\Box 102\4\ scan0004 | |
| Date | 22th May 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs{Lord Ernest Hives - Chair}/LS/LG22.5.25. SPRING FAILURES. | Life of springs. hrs. mins | Piece No. | Position on chassis. | Position of frac: to centre. | Position of leaf. | Thickness of leaf. | Brinell test. | |---|---|---|---|---|---|---| | 17 40 | F.53172 | N.S. rear. | 11" rear. | Top | .284" | 388 | | 24 45 | F.53172 | O.S. rear. | 21" forward. | Top | .283" | 363 | | 17 35 | " | N.S. rear. | 20 3/8" forward. | Top | .285" | 401 | | 8 10 | " | " | 20" forward. | Top | .285" | 415 | | 27 5 | " | O.S. rear | 19 7/8" forward. | Top | .286" | 388 | | 29 10 | " | " | 18 1/2" rear. | Top | .285" | 401 | | 27 10 | " | N.S. rear. | 15 1/2" forward. | Top | .285" | 401 | | 67 50 | F.51906 | O.S. front. | 7 1/2" rear. | Top | .237" | 401 | Average life of 4 N.S. rear springs = 22 hrs. 20 mins. " " " 3 O.S. " = Hs{Lord Ernest Hives - Chair}/L. Swindall. | ||