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).
Sending centri-cast and statically cast Bentley Main Bearings for experimental testing, including heat treatment instructions.
| Identifier | ExFiles\Box 115\3\ scan0211 | |
| Date | 17th March 1938 | |
| HPS.{Horace Percy Smith - Experimental Factory Mgr} EHS. (crossed out) cRHC. (crossed out) cHl. cRm. 1029 Hiles (handwritten signature) Hs{Lord Ernest Hives - Chair}/JWW.14/HM.{Capt. W. Hallam - Head Repairs} 17. 3. 38. AC9 - Bearings. ------------------ We have today forwarded to you the following Bearings for Experimental test:- 12 centri-cast Bentley Main Bearings. F1. 13 Statically cast Bentley Main Bearings. F2. and tomorrow morning we hope to forward you the full quantity of centri-cast Bearings. Please note that these Bearings are unheat-treated and the heat treatment should be as follows:- 175°C - 195°C for 12 hours before machining (as per Hl's memo' H1/L.VL.{V. Lewis / Mr Valentine} 9. 3. 38.) In view of the expense necessitated by testing, and as we are now dealing with a new process and material, we think it would be more economic to make one or two tests on a Rig to determine the frictional qualities of the alloy before assembling an Engine with the Bearings and putting it on the road. Hs{Lord Ernest Hives - Chair}/JWW. | ||