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).
Test results for buffer penetration and wheel arch clearance for different tyre sizes.
| Identifier | ExFiles\Box 16\7\ Scan087 | |
| Date | 1st August 1928 | |
| To DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} c. to Sg.{Arthur F. Sidgreaves - MD} X7410 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG23. 8.28. X7820 re. tests on buffer penetration. With reference to DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}3/M3.7.28 and DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}2/M14.8.28 Our tests shew that we can get 5/8" bump from full load. Under these circumstances we think that 17" wheel arch as shewn on N.sch. 2543 will be satisfactory for the 5.25" tyres but we feel it would be advisable to allow an additional 3/8" in the case of the 6" tyres. You will appreciate that we are having to repeat our tests on buffer penetration owing to the present tendency to spring cars ultra flexibly. We are satisfied with the 17" arch for the 5.25" tyres, however. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||