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 of dynamo output curves for a 20 HP model, comparing specified requirements against standard and high output armatures.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan082 | |
| Date | 1st July 1928 | |
| AMPERE OUTPUT APPROX. OPERATING VOLTAGE Y-Axis Values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 Inner Y-Axis Values: 14.0, 14.4, 14.8, 15.2, 15.55, 15.9, 16.2, 16.5, 16.8, 17.05, 17.3, 17.5, 17.7, 17.9, 18.1, 18.3, 18.5, 18.7 DYNAMO R.P.M. X-Axis Values (Top): 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600, 3800, 4000 CHASSIS M.P.H. 11/50 AXLE, 31.4" DIA. TYRES X-Axis Values (Bottom): 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 Curve 1: M (High Output Armature) 7° /26° July '28 Curve 2: REPRESENTATIVE OUTPUT CURVE OF STANDARD 20 HP DYNAMO AT 80°C. Curve 3: SPECIFIED CURVE OF OUTPUT REQUIREMENTS FOR 20 HP DYNAMO Boxed Text: 20 H.P | ||