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).
New 20 HP low stress valve spring for experimental testing and standardization.
| Identifier | ExFiles\Box 106\5\ scan0009 | |
| Date | 20th July 1927 | |
| A.{Mr Adams} 5060 E4/M20.7.27. To BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} c. to BJ. Hs.{Lord Ernest Hives - Chair} 20 HP. LOW STRESS VALVE SPRING. We send herewith LeC.2440 shewing the above. This should be instructed for experimental test with a view to standardisation. We are not we understand experiencing much trouble with 20 HP. valve springs on production, but this new spring has a better figure of merit than those at present in use, and should therefore have a larger margin of safety. At the same time we send you LeC.2443 shewing a comparison chart for valve spring stresses based on a simple formula. We should be glad if you would send us three blueprints of this chart for use in the office, and for filing. E.{Mr Elliott - Chief Engineer} | ||