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).
The latest design changes for a cheaper production B.60 crankshaft.
| Identifier | ExFiles\Box 124\2\ scan0145 | |
| Date | 25th April 1940 | |
| 1044 HES. from Ra/CTS.{C. Trot Salt - Carburation} Ra/CTS.{C. Trot Salt - Carburation}17/HL.25.4.40. c. to HPS{Horace Percy Smith - Experimental Factory Mgr}/THL. c. to Rd/AML. B.60 CRANKSHAFT. We send you herewith R.E.869 Crankshaft issued in the attached memo. ref: Ra/HL.2/JH.24.4.40. This represents our latest design for a cheaper production crank. The main features in this direction are: 1. Material. Spec. 2051. 2. Heat treatment in the forging state. 3. Brinell 241 - 269. 4. Machining to be continuous, but no machining on profiles of slabs and balance weights. 5. Welch plugs (Replacing oilers). 6. Integral balance weights. At the present time, the only way to get a figure of merit for such a shaft is as follows: Apply the following points to available forgings:- 1. Heat treatment to give 241 - 269 Brinell. (This has already been instructed and such forgings should, therefore, be available). 2. Welch plugs to replace oilers. (These will have to be made in the shop to suit, from a material of the same Brinell as the crank). An "inked-in" print could be worked to, for the necessary machining for these plugs on a normal B.60 shaft. Continued... | ||