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).
Bumping test that caused failures in the front springs and chassis frame.
Identifier | ExFiles\Box 119\2\ scan0184 | |
Date | 1st March 1924 | |
R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} X1331 EXPERIMENTAL REPORT. Expl. No. X1331 Y2628 REF: Hs{Lord Ernest Hives - Chair}2/LG10.3.24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to EY. WOR.{Arthur Wormald - General Works Manager} BUMPING TEST ON FRONT SPRINGS AND REAR ANCHORAGE. N.SCH.1706. We have been running a chassis on the bump test with the proposed standard fixed anchorage at the rear end of the front springs. We have broken two front springs; both failed after approximately 14 hours running. One fracture occurred 2" to the rear of the centre bolt and the other 2" to the front of the centre bolt. This is an average life for front springs. After 24 hours running the N.S. frame member cracked in the position shewn on the attached sketch. On our previous test when we anchored the rear end of the front springs, the frame broke in a similar position. It is only when we have fixed the rear end of the front spring that we have failures of this portion of the frame. It would appear necessary for us to strengthen the frame at this point. When the car is on the road it will get braking stresses which we do not get on the bump test. We are replacing the side member and continuing the tests. We are sending the section of the frame showing the crack to W.W. Hs.{Lord Ernest Hives - Chair} | ||