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).
Page 2 of a dynamo specification detailing minimum performance characteristics and physical constraints.
| Identifier | ExFiles\Box 51\1\ Scan139 | |
| Date | 26th March 1923 guessed | |
| -2- Contd. with increase of speed is preferable to one which remains up at a high ampere value. (N.B. 2000 r.p.m. of dynamo corresponds approximately to 27 m.p.h. road speed). Up to this point (2000 r.p.m.) the ampere output speed curves should lie completely above that given by the following figures, the dynamo operating terminal voltage being adjusted to be within ± .1 of the figure indicated by this table for each value of the ampere output. Minimum Specified Performance in fully hot condition. Speed. Operating Voltage Limit ±.1 Ampere output. Corresponding approx. miles per hour. 640 13.6 0 8.7 750 13.9 2.5 10.2 900 14.3 5.5 12.2 1200 14.75 9.0 16.3 1500 14.85 10.0 20.3 2000 14.75 9.0 27.1 (4) It is expected that the weight of the dynamo inclusive of pulley, but exclusive of suspension, will not exceed 25 lbs. and that the dynamo be perfectly electro-magnetically silent at all speeds and outputs, and that the carcase diameter will not exceed 5". EFC. {E. Fowler Clarke - Electrical Engineer} | ||