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 shape of dynamo output curves from Rolls-Royce and Lucas, plotted as ampere output versus miles per hour.
| Identifier | ExFiles\Box 60\4\ Scan011 | |
| Date | 4th December 1930 | |
| OUTPUT CURVES OF LUCAS DYNAMO FITTED TO 20 H.P. VAUXHALL BOOSTED BY ADJUSTMENT OF 3RD BRUSH. LOWER CURVE SHOWS EFFECT OF REDUCED CHARGE SWITCH. 20/25 R.R. DYNAMO 48 COIL AT SCHEDULE VOLTAGES (4.12.30) PHANTOM II HIGH OUTPUT DYNAMO AT 14 VOLTS TERMINUL P.D. PHANTOM II MEDIUM OUTPUT DYNAMO AT 14 VOLTS TERMINUL P.D. STANDARD 20/25 R.R. DYNAMO EFC 4 - AD 2.1.30. LUCAS DYNAMO FITTED TO 20 H.P. VAUXHALL IS 5" DIA x 7.2" LONG OVER END COVERS & IRON CARCASE IS 4.75" LONG. NORMAL RATED OUTPUT 12 AMPS. THE MACHINE IS BOOSTED UP SO THAT THE LOWER CHARGE NOW GIVES 12 AMPS. SHAPE OF DYNAMO OUTPUT CURVES COMPARED - R.R. & LUCAS. AS ABOVE. LeC. 2866 AXIS LABELS: AMPERE OUTPUT MILES PER HOUR. | ||