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 showing the governor advance curve for a distributor on a Wraith III engine.
| Identifier | ExFiles\Box 168\3\ img203 | |
| Date | 10th June 1939 | |
| GOVERNOR ADVANCE CURVE OF R.R. DISTRIBUTOR No. 1 TO DB{Donald Bastow - Suspensions}/2300 FOR WRAITH III No. 10. (14 B.V.) LIMITS TO RM{William Robotham - Chief Engineer}/SWDL{Len H. Swindell}/MM 10-6-39 INITIAL SETTING 4° B.T.D.C. ON FLYWHEEL MAIN SPRING AS DB{Donald Bastow - Suspensions}/2352 BUT FREE ANGLE 17° AUX. SPRING AS DB{Donald Bastow - Suspensions}/2370 BUT FREE ANGLE 30° LOAD TO 170° 2.750 LBS. RANGE REDUCED TO 12° BY INCREASING STOP WIDTH TO .800" ON GOVERNOR FRAME CAM BREAK PERIOD O.{Mr Oldham} O.{Mr Oldham} 12°E 1/4L O.{Mr Oldham} O.{Mr Oldham} ROCKER BLOCK .223" LIMIT GA4 DISTRIBUTOR SPEED R.P.M. | ||