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).
The failure of chassis cross members and spring stops during testing.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan87 | |
| Date | 22th May 1925 | |
| R.R. 485a (50m) (D.B. 173 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/LS/LG22.5.25. 2nd. cross member (channel shaped (F.51101) sheared through 3 1/4" from off-side frame member and starting to crack 4" from rear side after 36 hrs. 30 mins. New member fitted this shearing through after 31 hrs. 20 mins. The fracture in both cases were identical, both in position and shape across section. On completing 100 hrs. test of chassis third 2nd. cross member was found cracked 3 1/4" from nearside frame member. Considering that this member is subject to a stress similar to that of the other tube-section cross member, it would probably be an improvement to increase radius of horizontal flanges or make member of thicker material. Corners of flanges both near-side and off-side of 3rd. cross member broken off. The first corner cracked through after 65 hrs. and three out of four on each flange had gone on completion of 90 hrs. Spring stops on swivel pins (F.53402) sheared off due to breaking of rear springs and weight being thrown on to these stops. contd :- | ||