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 bumping test and failure analysis of an oval section pendulum steering lever, comparing it to a standard H section lever.
| Identifier | ExFiles\Box 171\3\ img012 | |
| Date | 25th April 1917 | |
| Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}2/L221014. REPORT ON BUMPING TEST OF OVAL SECTION PENDULUM STEERING LEVER F.4272. X.205. This lever was fixed to the complete steering gear on the bumping test and has been used during the testing of various parts. It has now broken where the lever joins the large boss after running 49 hrs 10 mins. on 3" bumps and 53 hrs 30 mins on 2" bumps at 105 revs per minute. The breakage commenced at the front side and shews the usual lined and smooth surface of long fatigue fractures. [Handwritten note on diagram] broke through here A previous test shews that the standard H section lever C.565 broke after running 5 hrs 25 mins on 3" bumps. The weight of C.565 is 1 lb 13 ozs. and the weight of the oval section lever F.4272 is 1 lb. 12 ozs. The oval lever shews up to great advantage in these results. [Text at bottom, inverted] H.R. 235A (500) (T) (S.D. 40B. 25-4-17) Bm. 2/156/13. | ||