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).
Recommendation to fit test bed clutches with stronger thrust springs to avoid trouble during testing.
| Identifier | ExFiles\Box 130\3\ scan0045 | |
| Date | 18th January 1939 | |
| 11/10 To HPS{Horace Percy Smith - Experimental Factory Mgr}/FS.{F. Steele} c. to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}23/JH.18.1.39. Clutches on test beds. In view of the fact that we use old driven plates on test beds, and most of these are or have been oily, it will be advisable to fit test bed clutches with stronger thrust springs so as to avoid risk of trouble during a test. We recommend that 11" clutches be fitted with 12 brown or black springs and 10" clutches with 9 white springs. Please see me re supplies of springs, when test bed clutches are dismantled. This of course need not apply when an engine is going on to a bed for a brief run with its own clutch. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||