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 bumping test results for front axles, detailing their lifespan and failure points.
| Identifier | ExFiles\Box 49\4\ Scan018 | |
| Date | 29th April 1914 | |
| Wor{Arthur Wormald - General Works Manager}/Mcrl/L29414. 423 April 29th.1914 LIFE OF PARTS ON BUMPING TESTS. F R O N T A X L E.{Mr Elliott - Chief Engineer} 3" Humps at 105 revs. per minute. | Piece No. | Description. | Time. Hours. Mins. | Results. | Reference. | |-----------|--------------------------------------------|--------------------|-------------------------------------------------|-------------------| | F2882. | Front Axle. | 89 | Broke. | Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}1/C13314 | | F3391 | Front Axle. | 9 - 8 | Cracked at top of I section | Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}27/L61113 | | | | 14 - 57 | Broke. | " | | F3391. | Front Axle, 2700 series Dunlop wire wheels.| 16 - 14 | Cracked top flange. | Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}8/L151213 | | | | 30 - 32 | Axle broke. | " | | F3391. | As above but strengthened near spring rests| 24 - 6 | Cracked. | Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}10/0.2114 | | | | 37 - 1 | Broke. | " | | F3391. | As above. | 39 - 5 | Cracked through off side spring clip hole. | Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}10/0.2114 | | | | 42 - 35 | Cracked through near side front spring clip hole. | | | | | 59 - 32 | Axle broke. | | | F3391. | Front Axle. | 24 - 0 | Cracked. | Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}2/L16114 | | | | 37 - 0 | Broke inside of near side spring. | | | ||