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).
Weight saving calculations for the Bentley IIA brake systems.
| Identifier | ExFiles\Box 85\1\ scan0365 | |
| Date | 28th October 1937 | |
| Bentley IIA Brake File To Gry.{Shadwell Grylls} from Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. Craster. 206 Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}8/WH.28.10.37. WEIGHT SAVING - BENTLEY. IIA BRAKES. Saving on rear axle 37 lbs. " " equalizer shaft 9 lbs. " " front axle 4 lbs. Total saving, Aluminium Drum System. 50 lbs. Saving on 4 brake drums in aluminium 11 lbs. Increase when C.I shoes are used 11 lbs. Total increase with iron drums 22 lbs. Total saving, iron drums, Girling Brakes 28 lbs. The iron drums mentioned above may be too light for satisfactory results as they have to be rigid to work well with Girling brakes. Only testing can show whether this is so. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||