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 for a 1700 type axle box with flanges and axle box 25% thinner than standard.
| Identifier | ExFiles\Box 49\1\ Scan015 | |
| Date | 8th September 1911 | |
| R.H. 148 (20 m) (W. 819 8.9.11) G 1919. x339 Axle strength tests, 1700 type with flanges of tubes & axle box 25% thinner than standard. Leverage 6 to 1 weight of bar & box 184 lbs. Weight | Deflection bottom of box | Deflection across lip of box | Deflection across bottom of box | End of tube to bedplate --- Nil, bar slung up | 0 | 0 | + .014" | 14 .015" 2508 lbs | .068" | -.009" | + .020" | 13 .968" 3852 " | .113" | -.016" | + .031" | 13 .937" 5196 " | .192" | -.033" | + .041" | 13 .906" 6540 " | .278" | -.038" | + .062" | No diff 7884 " | .383" | -.061" | + .083" | " 9228 " | .604" | -.119" | + .099" | No diff 10,572 " | 1.174" | collapsed Weight off | .772" | ||