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).
Comparison of centrifugal stress on 'Hyco' and 'No.6' materials or designs.
| Identifier | ExFiles\Box 141\1\ scan0131 | |
| Date | 30th April 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Smth.20/KW.30.4.36. 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. Yours faithfully, FOR ROLLS-ROYCE LTD. | ||