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 with 25% thinner flanges.
| Identifier | ExFiles\Box 49\1\ Scan013 | |
| Date | 10th May 1912 | |
| R.R '48 (20 m) (W 963. 13.10.11) G 2051. T/B/B 339 500 10/5/12 Axle strength tests, 1700 type axle with 25% thinner flanges on tubes & axle box than standard, load applied on top of the box. Weight | Deflection bottom of box | Deflection across flanges and caps | Deflection across bottom flanges | End of tube to back plate 0 | 0 | 0 | + .014" | 14.015 2278 | .068" | -.009" | + .020" | 13.968 3,622 | .113" | -.016" | + .031 | 13.937 4,966 | .192" | -.033" | + .041 | 13.906 6,310 | .278" | -.038" | + .062 | Slightly 7,654 | .382" | -.061" | + .083 | " 8,998 | .604" | -.119" | 0.099 | " 10,342 | 1.174" | collapsed | collapsed | " Weight off | .772" | " | " | " JAH | ||