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).
Recommending a change to the Phantom III water pump coupling to improve flexibility and reduce wear.
| Identifier | ExFiles\Box 149a\1\ scan0178 | |
| Date | 17th February 1938 | |
| To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 1269 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}10/MH.{M. Huckerby}17.2.38. PHANTOM III WATER PUMP COUPLING. The present production spring plate coupling which has 3 plates (E.85144) (.018 thick) has been complained of as being too stiff and inflexible, causing squeaks and wear on the water pump shaft. We have recently tested over 50 hrs. on an endurance unit couplings having 3 plates E.89188 (.0076) thickness. These are hardly strong enough for the job as although there is no fracture in any of the plates they are showing signs of buckling. We would point out that the 3 plates (.0076) thickness give a resultant flexibility of 7 or 8 times that of the standard plates which are .018 thick. Wraith is equipped with coupling plates 3 off (DW.200) which are .0124 thick, and gives a flexibility figure of approx. 3 times the .018 thick plates. Our recommendation, therefore, based on the results obtained is that we should adopt the Wraith plates DW.200 (.0124) on Phantom III for production which give increased flexibility and will be common to the two engines. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||