Instructions and test results for a No. R3 Dynamo (9II) with an annealed copper commutator, intended for a 20HP chassis.
| Identifier | ExFiles\Box 50\5\ Scan320 | |
| Date | 21th June 1924 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. To E.Y.B. Order No. W.A.48 Customer's No. X 4333 No. R3 Dynamo (9II) with annealed copper commutator. This dynamo is now ready for placing on a 20HP chassis. New Z grade standard brushes have been fitted and bedded and the machine has been set to our general specification. The figures for output etc when hot are as follows:- Carcase temperature 72.5°C. Ampere output 12.1 amperes Volts at Dynamo terminals 15.0 volts. Open circuit volts at 640 R.P.M. 15.5 volts. The volt-ampere characteristic in the same hot condition is as follows:- Signed contd | ||
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).