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).
Axle strength test results table for a standard 1700, type X339 axle, detailing deflections under load.
| Identifier | ExFiles\Box 49\1\ Scan020 | |
| Date | 21th May 1912 guessed | |
| Axle strength tests, standard 1700, type. X339 load applied on top of axle box. WEIGHT lbs., Deflection across flange at Top., Deflections across flanges at Bottom., Deflection at Bottom of Box., Weight from end of tube to bed plate. 0, 0, .030", 0, 11.640" 2448., -.007", .035", .024", - 3792', -.013", .041", .057", - 5136., -.018", .046", .098", - 6480, -.025", .056", .158", 11.625" 7824, -.034", .065", .210", 11.609" 9168, -.044", .080", .288", - 9840, -.055", .090", .342", - 10512, -.064", .108", .411", 11.593" 11184, -.079", .120", .500", - 11856, -.094", .140", .616", - 0, -.053", .050", .287", - 11184, -.094", .135", .566", - 11856, -.104", .150", .631", - 12528, -.109", .152", .723", - 12864 collapsed | ||