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).
Necessary adjustments for the Bentley III & 50 brakes.
| Identifier | ExFiles\Box 111\3\ scan0220 | |
| Date | 5th September 1938 | |
| 806 also 406 To Ds. from RM{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. Hy.{Tom Haldenby - Plant Engineer} c. Hdy.{William Hardy} c. By/CRL.{C. R. Lisson} c. HPS.{Horace Percy Smith - Experimental Factory Mgr} c. RM{William Robotham - Chief Engineer}/IMn. RM{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}3/MH.{M. Huckerby}5.9.38. BENTLEY III & 50 BRAKES. Further points which need attention on these brakes are as follows:- (1) The hand brake quadrant does not allow enough hand brake travel. It now has 9 teeth; it should be lengthened at the top end so that it has 11. The rubber stop on the hand brake should be deleted, thus allowing all the quadrant travel to be useful. (2) The hand brake pull off spring should be 5 to 6 lbs. on the hand brake rod in the off position. The spring GW.1990 is the best spring to use and it gives 5-6 lbs. pull when stretched to 7". (3) On the rear brakes for the semi-floating axle, the deflection of the carrier plates is such that to ensure simultaneous touching of the "on" stop on the rear brakes intermediate shaft and the "on" stops in the Girling expanders under 120 lbs. pedal load, the brake rod between rear brake intermediate shaft and equalizer (which was formerly a rope) has to be shorter by 5 half turns on its 5/16" thread (0.1135") than it would be to get the stops touching simultaneously under no load. It is essential to set the brakes in this manner in order to use the full wedge travel, and the safety stop setting is carried out with the rod disconnected, as usual. On the brakes for the fully-floating axle, the rod has to be shortened by 6 full turns. We think that the rear carrier plates for the semi-floating assembly should be stiffened as much as possible, without making major alterations, and that the carrier flange should also be slightly stiffened. Cars now built or being built do not require alteration | ||