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).
Log of front axle bumping test results, detailing failures and longevity.
| Identifier | ExFiles\Box 49\4\ Scan212 | |
| Date | 1st July 1926 guessed | |
| LIFE OF PARTS ON BUMPING TESTS. FRONT AXLE. 3" Humps at 105 revs. per min. Piece No. | Description. | Time. hrs.mins. | Results. | Reference. --- | --- | --- | --- | --- F.2882 | Front axle. | 39 | Broke. | Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 1/C13314 F.3391 | Front axle. | 9 8, 14 57 | Cracked at top of I section. Broke. | Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 27/L61113 F.3391 | Front axle, 2700 series. Dunlop wire wheels. | 16 14, 30 32 | Cracked top flange. Axle broke. | Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 8/L151213 F.3391 | As above but strengthened near spring rests. | 24 6, 37 1 | Cracked. Broke. | Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 10/0.2114 F.3391 | As above. | 39 5, 42 35, 59 32 | Cracked through O.S. spring clip hole. Cracked through N.S. front spring clip hole. Axle broke. | Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 10/0.2114 F.3391 | Front axle. | 24 0, 37 0 | Cracked. Broke inside of N.S. spring. | Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 2/L16114 contd :- | ||