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).
Letter discussing clutch material stress for 'Hyco' and 'No.6' and enquiring about cadmium plating on driven plate hubs.
| Identifier | ExFiles\Box 129\3\ scan0238 | |
| Date | 4th May 1936 guessed | |
| -2- These figures confirm the theory that there is a weakest direction for "Hyco". We are pleased to see that the joint does not appear to cause a weakness in "No.6". The actual centrifugal stress with the clutch disengaged at top engine speed is 2000 lbs/sq.in. for "Hyco" and 1280 lbs/sq.in. for "No.6" (less owing to its lower density). It would appear therefore that "No.6" ought to be strong enough for this application. We should like to know the depth of the cadmium plating on the driven plate hubs you fit to the 10" and 11" clutches. Will the spline clearances become excessive after prolonged use owing to the wearing of the cadmium ?. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||