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 spring failures during testing, detailing average life and fracture positions.
| Identifier | ExFiles\Box 119\2\ scan0182 | |
| Date | 10th March 1924 guessed | |
| SHEET 4. ANALYSIS OF SPRING FAILURES DURING TEST. Total number of failures { Off side - 5 { Near side - 11 Average life of springs. | PARTICULARS | OFF SIDE. | NEAR SIDE. | BOTH SIDES. | |---|---|---|---| | | No. of Springs. | Average life. Hrs,mins. | No.of Springs. | Average life. Hrs,mins. | No. of Springs. | Average life. Hrs,mins. | | All springs throughout test. | 5 | 17 7.8 | 11 | 9 47.1 | 16 | 12 4.8 | | Firth springs only. | 1 | 10 43 | 2 | 9 19 | 3 | 9 47 | | Woodhead springs only. | 3 | 18 51.6 | 8 | 8 53.4 | 11 | 11 36.5 | | All springs since removal of r.rods. | 4 | 18 44 | 8 | 10 7.9 | 12 | 12 59.9 | Position of fractures. | PARTICULARS | Springs fractured at front of axle. | Springs fractured to rear of axle. | Springs fractured both sides of axle. | |---|---|---|---| | All springs. | 31.2% | 50% | 18.8% | | O.S. springs only. | --- | 100% | --- | | N.S. " " | 45.4% | 27.3% | 27.3% | | All springs previous to removal of radius rods. | 25% | 50% | 25% | | All springs since removal of radius rods. | 33.3% | 50% | 16.7% | | ||