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).
Material requirements for the Bentley Contact Breaker Spring.
| Identifier | ExFiles\Box 3\4\ 04-page343 | |
| Date | 21th June 1933 | |
| Handwritten: 7/PH/34 To Mr. [struck through] from E.{Mr Elliott - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} Hs.{Lord Ernest Hives - Chair} Heyist. [struck through] E.B/HP.21.6.33. ---------------- Bentley Contact Breaker Spring. ----------------------------- With regard to the above, the duty of the contact breaker spring on the Bentley owing to the fact that we are using a 6 lobe cam single breaker running up to very high speeds is greater than the duty we have required from any other contact breaker springs. We, therefore, think the material should be high alloy steel such as we use for valve springs, road springs, etc. The springs that have been supplied for the 20/25 chassis in the past by Messrs. Gillott have been satisfactory, but they have not had such a severe duty to perform, and we, therefore, think the material question is worth looking into before committing ourselves to the same as used previously on the 20/25. E.{Mr Elliott - Chief Engineer} | ||