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).
Graph comparing the wear characteristics of 'Graphite Bronze' and 'Ferodo Rad 11' driving faces.
| Identifier | ExFiles\Box 129\4\ scan0104 | |
| Date | 10th December 1937 | |
| WEAR OF EACH DRIVING FACE. RADII SPRINGS 141 LBS. BRONZE SPRINGS 161 LBS. μ = .18 TAKE UP NORMAL μ = .157 TAKE UP QUICK NUMBER OF SLIPS AT 30 SECOND INTERVALS WEAR OF EACH FACING Graph Line 1: GRAPHITE BRONZE Annotations for Line 1: NO SLIP, SOME SLIPPING, OCCASIONAL SLIPPING, SLIP GRADUALLY INCREASING AS SPRINGS LOOSE POUNDAGE, SPRINGS 117 LBS μ = .215 SLIPPING BADLY Graph Line 2: FERODO RAD 11 Annotations for Line 2: SOME SLIPPING, SPRINGS 132 LBS μ = .192 EXCESSIVE SLIP Right Side Data: WEAR RATIO 5.4 TO 1 WEAR RATIO 5.5 TO 1 WEAR RATIO 7 TO 1 WEAR RATIO 8 TO 1 WEAR RATIO 5.1 TO 1 WEAR RATIO 4.75 TO 1 WEAR RATIO 4 TO 1 W.P.B-C 10/12/37 RM.{William Robotham - Chief Engineer}476 | ||