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).
9,500-mile test comparing the wear of casehardened bushes versus bronze bushes for spring shackles on a Goshawk-11.
| Identifier | ExFiles\Box 49\3\ Scan187 | |
| Date | 16th May 1923 | |
| Y4261 To R. {Sir Henry Royce} from Hs. {Lord Ernest Hives - Chair} c.c. to CJ. c.c. to H. {Arthur M. Hanbury - Head Complaints} c.c. to De. c.c. to BY. {R.W. Bailey - Chief Engineer} HsS/LG16.5.23. CASEHARDENED BUSHES FOR SPRING SHACKLES. Y4261 We have been running 6-Goshawk-11 with all the shackles on one side of the car having case-hardened bushes and all the shackles on the other side having bronze bushes. The car has run 9,500 miles since they were fitted. It has been regularly lubricated. As regards the shackles on the rear springs, there is very little wear on either the casehardened or bronze bushes. They both look good for considerably more mileage. With regard to the front shackles, there is less wear on the bolts working with the bronze bushes than those with the casehardened bushes. The amount of wear on the front shackles of the 20 HP. is always considerably more compared with that we get on the rear shackles. The least movement of the shackle bolts soon causes rapid wear. From the results of the tests, we cannot notice any advantage when using the casehardened bushes in place of the bronze bushes. With both types of shackles we are using casehardened washers to take up the end play. The casehardened bushes become corroded and rusted where they are not rubbing. Hs. {Lord Ernest Hives - Chair} | ||