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).
Meeting minutes discussing the design and specifications for experimental valve springs.
| Identifier | ExFiles\Box 80\3\ scan0092 | |
| Date | 22th December 1911 | |
| Valves and Valve Springs. Contd. (7) agreed to the scheme having the halves forming the covers bolted together by two bolts at about their centre. A slight modification was necessary to this scheme to allow for variation in the vertical distance between the tappet guides and the cylinders. 103rd Meeting Dec. 22nd.11. Re Valve Springs (Experimental) Mr Swetnam had previously submitted figures concerning the design of a new valve spring which would give a minimum and maximum stress in the metal of 43,000 and 57,000 lbs per sq. in. respectively. Mr Swetnam had based his design from a spring obtained from the shops, which he had believed to be a standard one. The Springs when delivered to this design had proved to be incorrect and giving too great a load when fully compressed. The Committee had recommended that the spring should be made from wire of the same diameter as our standard, but having an extra coil to be accommodated by a stepped washer. Such a spring they understood from Mr Swetnam would have a maximum stress of about 57,000 lbs. per sq. inch. The Committee now agreed that further and more | ||