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).
Design of brake operating gear, focusing on pin sizes, servo performance, and the co-efficient of friction.
| Identifier | ExFiles\Box 73\2\ scan0327 | |
| Date | 10th April 1924 | |
| X.9940 To DA.{Bernard Day - Chassis Design} HS{Lord Ernest Hives - Chair} - from R.{Sir Henry Royce} c. to CJ. RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} S E C R E T. R4/M10.4.24. E.A.C. BRAKE OPERATING GEAR - (COMBINED SYSTEMS - N.SCH.1782) - X.9940. As far as I can see this seems about right, but pins and parts look very strong for the load. We use big pins on back axle because of the wear, no lubrication, much vibration, and mud and here it seems different and one would think could be smaller and lighter. I cannot understand how we get wrong with our servo. Have we the correct μ co-efficient of friction? Could we not use the unbonded material with greater co-efficient, as the design allows this. I cannot say I favour brakes as vigorous as Hispano for the foot pressure, and should prefer it to need more, and be very consistent. R.{Sir Henry Royce} | ||