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).
Load tests and design recommendations for front wheel brake torsional pull-off springs.
| Identifier | ExFiles\Box 66\5\ scan0098 | |
| Date | 31th January 1927 | |
| Y8420 To BY. {R.W. Bailey - Chief Engineer} from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 3/LG31.1.27. FRONT WHEEL BRAKES. TORSIONAL PULL OFF SPRINGS. Y8420 X7420 From tests we have carried out we find that a load from 9 to 9 1/2 lbs. at the extremity of lever G.74863 is necessary if the springs are to function satisfactorily. We realise with springs G.74280 this means a stress of somewhere about 100,000 lbs., but we have actually run a car 10,000 miles upon which the load at the end of this lever has been over 9 lbs. without any trouble. If any alteration is contemplated to these springs, as with the new axle with altered angle of brake shafts, we consider it would be desirable for the spring to be designed so that it could give 10 to 11 lbs. pull off on the lever indicated i.e. 32 to 35 ins.lbs. torque. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} | ||