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).
Specifications for dynamo performance under hot conditions, detailing output, weight, and size constraints.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan155 | |
| Date | 4th March 1924 guessed | |
| -2- Contd. Up to this point (1500 r.p.m.) the ampere output speed curve 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 Ampere Corresponding approx. Voltage output. miles per hour. Limit ± .1 Drive ratio. Drive ratio 1.5 1.7 540 13.6 0 10 9 600 14.0 2.75 11.5 10 650 14.25 5.0 12.5 11 700 14.5 7.0 13.5 12 800 14.7 9.0 15 13.5 900 14.85 10.0 17 15 1150 15.0 11.0 22 19.5 1500 14.85 10.0 29 25 (4) It is expected that the weight of the dynamo inclusive of pulley, but exclusive of suspension, will not exceed 35 lbs. and that the dynamo be perfectly electro-magnetically silent at all speeds and outputs, and that the carcase diameter will not exceed 6". + NOTE:- Car miles per hour at 540 r.p.m. of dynamo for various drive ratios are as follows :- Ratios. M.P.H. 1.5 10.3 1.56 9.95 1.7 9.15 EFC. | ||