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).
Performance graph showing the output curves for a 20 HP dynamo.
| Identifier | ExFiles\Box 165\6\ img107 | |
| Date | 14th April 1927 | |
| 20 H.P. REPRESENTATIVE OUTPUT CURVE OF STANDARD 20 H.P. DYNAMO AT 80°C SPECIFIED CURVE OF OUTPUT REQUIREMENTS FOR 20 H.P. DYNAMO. Handwritten text on curve: OUTPUT CURVE OF DYNAMO No. A/126. 12.5 AMPS. 1500 R.P.M. 17.5 VOLTS. Handwritten text in center: MAX PERMISSIBLE REPRESENTATIVE OUTPUT OF 20 H.P. DYNAMO No. 1087. Handwritten text in top left: A/66 Handwritten text in top right: Ref. Rotax A.F. 93 (14.4.27) Y-Axis: AMPERE OUTPUT Y-Axis (scale): APPROX: OPERATING VOLTAGE X-Axis: DYNAMO R.P.M. X-Axis: CHASSIS M.P.H. 11/50 AXLE. 31.4" DIA: TYRES. | ||