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).
Comparison of specifications for different Bentley front brake drums, detailing part numbers, cooling areas, and temperatures.
| Identifier | ExFiles\Box 85\1\ scan0049 | |
| Date | 17th March 1936 | |
| x206 FILE. Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}10/JH.17.3.36. Bentley Front Brake Drums. (1) The old standard drum was GB.1216. (2) " new " is GB.2008. (3) This latter can have its ribs increased by .075". The cooling area of (1) is 195 sq.ins. " " " (2) " 200 " " " " " (3) " 224 " " If the max. temperature of (2) is 300°C. then " " " (3) is 268°C. The difference of weight will be about .65 lbs. We are comitted to 800 of these drums. Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale} | ||