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, showing average life and fracture positions.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan43 | |
| Date | 2nd January 1924 | |
| 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 radius rods. 4 18 44 8 10 7.9 12 12 59.9 Position of fractures. Springs fractured to 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. springs only. 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% | ||