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 Phantom III tappets, recommending new fittings and weaker springs.
| Identifier | ExFiles\Box 96\2\ scan0176 | |
| Date | 9th December 1936 | |
| 354 To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/AP.9.12.36. PHANTOM III. TAPPETS. In view of the tests we have carried out on bottom tappets resulting in poor condition of both 'Hykro' and S/ZN (cloudburst) standard Fescolised tappets should be fitted to both No.9. (35-EX. 15,000 miles) and No.14. Continental Unit. The bottom tappet springs we have found are much too strong and on the above units weaker springs to E.88500 should be fitted. These should be produced in S/CV. our standard valve spring wire. Rm{William Robotham - Chief Engineer};Swdl.{Len H. Swindell} | ||