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).
Component failures and hours run during bumping tests with 2' bumps at 60º and a drum speed of 105 per minute.
| Identifier | ExFiles\Box 80\2\ scan0036 | |
| Date | 27th November 1919 | |
| R.R. 235 100 T) (S F.{Mr Friese} 575. 16-4-19) G 2354 X.2628a EH/LG27.11.19. FAILURES ON BUMPING TESTS - DRUMS FITTED WITH 2" BUMPS AT 60º - DRUM SPEED 105 PER MINUTE. Handwritten notes: X.1331 X2628 X3440 (all crossed out) Part failed. | Piece No. | Hrs. run | Remarks. --- | --- | --- | --- Front Spring Clip. | K.5400 | 6 | Off side. " " " | K.5400 | 9.25 | Near Side. " " " | K.5400 | 14.20 | " " " " " | K.5400 | 35.35 | " " Front Spring. | F.4625 | 8.25 | Top leaf broke near clips O.S " " | F.4625 | 13.45 | " " " " N.S " " | F.4625 | 9.25 | " " " " O.S " " | F.4625 | 26.15 | " " " " O.S " " | F.4625 | 26.40 | " " " " N.S " " | F.4625 | 35.35 | 2 Bottom leaves broken N.S Centre Bolt for Front Spring - | K.5900 | 29.45 | Broken in threaded portion O.S " " " " " | K.5900 | 1.20 | " " " " " N.S Bolt on rear engine bkt. & Frame - O.S. | | 10.40 | Head broken off. " " N.S. " " | | 68.15 | " " Bolt in N.S. diagonal stay. | | 32.55 | " " C.S. " " | | 19.10 | Steering Rocking Lever. | F.6981 | 80.0 | Ends of both arms broken off. Side Member of Frame | F.5297 | 80.35 | Cracked through holes for Radiator Support. | ||