Spring failures, showing test duration, chassis position, fracture details, and material properties.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan86 | |
| Date | 1st May 1925 | |
| R.R. 493A (50B) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs {Lord Ernest Hives - Chair} /L/LG22, 5.25. SPRING FAILURES. | Life of spring. hrs.mins. | Piece No. | Position on chassis. | Position of fracture to centre. | Position of leaf. | Thickness of leaf. | Brinel test. | |---|---|---|---|---|---|---| | 17 40 | F.53172 | N.S. rear. | 11" rear. | Top | .284" | 388 | | 24- 45 | F.53172 | O.S. rear. | 21" forward | Top | .285" | 363 | | 17 35 | " | N.S. rear | 20¼" forward | Top | .285" | 401 | | 8 10 | " | " | 20" forward | Top | .285" | 415 | | 27 5 | " | O.S. rear. | 19" forward. | Top | .286" | 388 | | 29 10 | " | " | 18¼" rear | Top | .285" | 401 | | 27 10 | " | N.S. rear. | 15¼" forward | Top | .285" | 401 | | 67 50 | F.51906 | O.S. front.| 7¼" rear | Top | .237" | 401 | Average life of 4 N.S. rear springs = 22 hrs. 20 mins. * * * 3 O.S. * * = 22 hrs. 20 mins. Hs {Lord Ernest Hives - Chair} /L. Swindall. | ||
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).