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).
List of results from dynamometer bump tests on various vehicle frames.
| Identifier | ExFiles\Box 119\2\ scan0005 | |
| Date | 26th September 1913 | |
| Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}4/L.26913. X1331 September 26th.1913. List of Frames which have been tested on dynamometer bumps 3" high. 105 bumps to each wheel per min. | Test No. | Type of Frame. | Horns set down. | Heat treated | Type of front cross member. | Time in mins. to break frame. | Where break-age occured. | |---|---|---|---|---|---|---| | 1. | 2200 | 8.25" | No. | Original type, thin flange which broke replaced by stiffened type. | 395 | Off side through front bolt holes of cross member. | | 2. | 1700 | 7.25" | No | Original type thin flange which broke. | 210 | Off side through front bolt holes of cross member. | | 3 | 1700 | 7.25" | No | Original type with thickened flange. | 120 | as above. | | 4 | 2200 | 8.25" | Yes | 2 3/4" dia. tubes, flanges with long bosses. | 470 | as above. | | 5 | 1700 | 7.25" | Yes | Swivel joint at each end allowing fore & aft movement of frame sides. | 246 | Near side through front bolt hole of cross member. | | ||