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).
Comparative performance curves for the Goshawk dynamo.
| Identifier | WestWitteringFiles\J\May1923\ Scan73 | |
| Date | 28th May 1923 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. & PH; c. Da.{Bernard Day - Chassis Design} c. Hy.{Tom Haldenby - Plant Engineer} c. EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL EPC1/T28.5.23. X.4363- HR. GOSHAWK DYNAMO. Herewith please receive photostat copy of further Goshawk dynamo curves. These are comparative curves of two standard experimental machines, and of one of these temporarily wound with 20 S.W.G. field winding instead of 19 S.W.G. The minimum specified performance (general specification) is also shown dotted. The curves correspond of course to the recently standardised new brush position and are the curves obtainable with the control brush so set, that with the machines running on maximum output (practically identical with maximum heating effect) the temperature will not exceed 75oC, the curves actually being taken with the machines at the temperatures indicated thereon. These curves are identical with those for the same brush position on photostat sheets 1, 2 & 3 given under cover of our EPC1/T3.5.23. It will be seen that the output curve of the standard machine is now very good. It easily complies with our minimum specified performance (general specification) as regards output, though some of the machines do not comply as regards cutting in point. Attached to E's copy please find up-to-date copies of our general specification of performance and of the production specification of test, as now finally standardised for the Goshawk dynamo. Contd. | ||