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 output speed performance curves for various dynamos at 80°C.
| Identifier | Morton\M19\ img281 | |
| Date | 4th February 1931 | |
| 40/50 OUTPUT SPEED PERFORMANCE CURVES OF VARIOUS DYNAMOS AT 80°C FULL CURVE LUCAS E.60 DYNAMO N° E.1640 I. R.R. 56 COIL PHANTOM II DYNAMO 9° 122° (62°C SETTING) II. R.R 48 COIL MEDIUM OUTPUT DYNAMO 16° 132° (58°C SETTING) III. R.R 48 COIL HIGH OUTPUT DYNAMO 19.5° 129° (62°C SETTING) DYNAMO R.P.M 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 CHASSIS M.P.H. WITH 11/41 AXLE & 33.0" TYRE DIA. 20 25 30 35 40 45 50 55 60 65 70 F.J.A. 19.1.31 E.F.C 4.2.31 | ||