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).
Suitability of alternative Admiralty specification steels for gun barrels and clarifying minimum yield strength requirements.
| Identifier | ExFiles\Box 176\3\ img120 | |
| Date | 16th August 1940 | |
| 7a To Rm.{William Robotham - Chief Engineer} from Ve. Ve.1/CB.16.8.40. In reply to your memo Rm.{William Robotham - Chief Engineer}7/ML.14.8.40, we can use one of the steels covered by Admiralty specification E/38/AB. as these steels are of the same class as the PP steel used for the original barrels. Instructions are being issued authorizing Admiralty OO. steel as an alternative to Vibrac. We can make little or no use of the Admiralty AA{D. Abbot-Anderson} steel, the yield being too low. The light weight of the gun has been achieved by using alloy steels for highly stressed parts and light alloys for parts which are not highly stressed. Consequently there are no major components where a steel of modest strength would be useful. I would point out that we require for the barrel a steel of 50 tons minimum yield, not 40 to 50 tons. I believe that By/EM. is clear on this point, but it might be worth while to confirm so important a figure with him. [Signature] Ve. | ||