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 fully hot conditions, including a table of speed, voltage, and output.
| Identifier | ExFiles\Box 60\1\ Scan095 | |
| Date | 8th April 1929 guessed | |
| Contd. -2- Up tot this point (1650 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 Voltage Limit ±.1 Ampere output. Corresponding approx. miles per hour Drive ratio = 1.5 600 14.0 0 10.5 650 15.0 2.55 11.5 700 15.9 5.0 12.0 750 16.35 6.5 13.0 850 16.9 8.5 15.0 1000 17.3 10.0 17.5 1250 17.5 11.0 22.0 1650 17.3 10.0 29.0 (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". EFC. + Note:- Car miles per hour at 600 r.p.m. of dynamo and 1.5 drive ratio is 10.5 | ||