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 the open-circuit volt-speed curve for a Rotax Type A.T. 12 Dynamo.
| Identifier | WestWitteringFiles\E\November1920\ Scan57 | |
| Date | 22th October 1926 | |
| ROTAX TYPE A.T. 12. DYNAMO Open circuit volt-speed curve (Hot condition) VOLTS 60 50 40 30 20 10 0 DYNAMO SPEED (R.P.M.) 0 100 200 300 400 500 600 700 800 900. NORMALLY HOT COLD FULLY HOT 12.4 VOLTS 347 R.P.M. 390 R.P.M. 13.6 volts E.P.C. 22/10/26 | ||