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 73\2\ scan0172 | |
| Date | 12th July 1923 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. , 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% | ||