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 drawing for a silent front drum brake assembly.
| Identifier | WestWitteringFiles\K\November1923\ Scan89 | |
| Date | 25th June 1927 | |
| SILENT FRONT BRAKE. 15.76 DIA. THIS IS THE DIA. IN MEAN BRAKING POSITN I.E. WHEN SHOES ARE JUST IN CONTACT WITH DRUM. 60° OPERATING CAM. FERODO EASED AWAY 3/4" EACH END. SHOE 112° (FERODO) 5.5 RAD. ANGLE BETWEEN SHOE PIVOT & START OF FERODO 35° 8°36' 29°24' 6.70 RAD. 2.00 76° 9.70 FRICTION SURFACE 1 SHOE = 112°. ANGLE BETWEEN SHOE PIVOT & START OF FERODO = 29.5° (APP.) ANGLE BETWEEN SHOE PIVOTS = 17° (APP.) O.S. 25.6.27 | ||