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).
Dynamo amperage discharge and output specifications at various speeds.
| Identifier | ExFiles\Box 11\3\ 03-page155 | |
| Date | 28th June 1930 | |
| 24-EX - 28/6/30. DYNAMO Head, side, tail and facia lamps on:- 20 M.P.H. - 7.5 amps. discharge 30 M.P.H. - 2.0 " 40 M.P.H. - 2.0 " 50 M.P.H. - 3.0 " 60 M.P.H. - 3.5 " 70 M.P.H. - 4.0 " ---------- DYNAMO OUTPUT HALF CHARGE 20 M.P.H. - cuts in 30 M.P.H. - 5.5. amps. 40 M.P.H. - 8.0 " 50 M.P.H. - 8.5 " 60 M.P.H. - 8.5 " 70 M.P.H. - 8.5 " 75 M.P.H. - 7.5 " | ||