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).
Analysis of the material composition and lifespan under load for six Woodhead springs.
| Identifier | ExFiles\Box 180\M3\M3.4\ img038 | |
| Date | 20th September 1924 | |
| -3- Analysis of 6 Woodhead F.W. Springs. ANALYSIS OF TOP LEAF No. of spring | Load lbs. | Life hrs. mins | Thickness of Top Leaf | Brinell | Carbon | Manganese | Chromium | Silicon | Phosphorus | Sulphur 1 | 950 | 23 5 | .282" | 375 | .53% | .54% | 1.08% | 1.05% | .030% | 2 | 950 | 17 42 | .282" | 388 | .50% | .56% | 1.06% | .82% | .042% | 3 | 1000 | 29 6 | .286" | 388 | .40% | .54% | 1.02% | .72% | .047% | 4 | 1000 | 18 5 | .293" | 388 | .47% | .58% | .81% | .94% | .032% | .023% 5 | 950 | 20 1 | .292" | 363 | .40% | .97% | .97% | .94% | .030% | .030% 6 | 1000 | 20 58 | .300 | 363 | .55% | .56% | 1.00% | .65% | .027% | .030% N.B. The sulphur content for springs Nos. 1, 2 and 3 was not estimated exactly but was found to be quite normal. Some of these springs are slightly higher in manganese and chromium than is usual, otherwise they are normal. Comparison of life of front springs when classified under Load. DETAILS. | Life of spring (in hrs and mins) | 950 lbs. | 1000 lbs. | 1050 lbs. | 1100 lbs. | 1150 lbs. | 1200 lbs. | 1250 lb Firths 25% | 14 - 38 | 14 - 0 | 18 - 43 Life of Individual Springs. | (Column data for Individual Springs Life) 950 lbs: 14 - 0, 10 - 4 1000 lbs: 18 - 4, 13 - 40, 15 - 7, 10 - 40 1050 lbs: 15 - 30, 13 - 4, 17 - 45, 10 - 44 1100 lbs: 11 - 11, 9 - 25, 21 - 1 1150 lbs: 13 - 16, 18 - 16, 10 - 51 1200 lbs: 15 - 52, 19 - 5, 13 - 23, 16 - 7 1250 lb: 24 - 48, 27 - 48, 18 - 30, 23 - 26, 23 - 40, 23 - 37 Average life (Column data for Average life) 1000 lbs: 13 - 16 1050 lbs: 14 - 17 1100 lbs: 14 - 35 | ||