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 reversal test of steering pivot F3783.
| Identifier | ExFiles\Box 2\12\ B002_X168-page201 | |
| Date | 11th December 1913 | |
| From Exp.Dept. Copies For:- R.{Sir Henry Royce} J.{Mr Johnson W.M.} Wa.{Mr Wallis} Da.{Bernard Day - Chassis Design} EGB/R20/B111213. Report on reversal test of steering pivot.F3783. X168. This pivot is different to the 2700 type pivot F3697 in that the U section is lighter, the hole in stub is smaller, making the root thicker, and it is recessed on the taper part of stub between the bearings. The usual road wheel with tyre was fitted weighing 100 lbs. and the speed of the operating crank was 575 revs. per min. The weight of F3783 is 7 lbs. 3 ozs. and F3697 weighs 7 lbs. 7 ozs. The new piece is therefore 4 ozs. lighter. The test run for 100 hours and the pivot was not broken so the test was stopped. The previous longest test was of pivot 5471 which broke in 78 hours. This however, is an old type pivot with a large forged oil catcher. F2263 which is the pivot we fitted to replace weak ones recently, lasted not more than 60 hours on this test. The results gained with F3783 are therefore excellent on this test. A pair is now running on the bumping machine, and if they show up well on this test I shall recommend them for standardisation. 11 cross steering levers were broken during the test as follows:- Nearside 5447. 32 hours 53 mins.(this lever merely acts as an idler.) Offside 5446. hrs. mins. " " 2- 47. " " 2-3. " " 7- 48. | ||