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).
Output performance and test results for the Goshawk dynamo.
| Identifier | WestWitteringFiles\J\December1922\ Scan70 | |
| Date | 7th December 1922 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. & PN.{Mr Northey} c. Hy.{Tom Haldenby - Plant Engineer} & EP.{G. Eric Platford - Chief Quality Engineer} c. Rg.{Mr Rowledge} & Ds. ORIGINAL. EFC2/T7.12.22. X.4383 - GOSHAWK DYNAMO OUTPUT PERFORMANCE. Herewith please receive photostat copy of some output and field current curves of the Goshawk dynamos on the bench. These output curves, in common with all those previously reported, have been taken on the bench with the dynamos clamped between wooden blocks so as to be more or less heat insulated, and this particular group of curves (except the Lucas curve) has been taken with the end covers in place. The specified performance shown is as previously intended to be the minimum accepted performance for Goshawk dynamos run under these conditions. There is one curve given for one machine in a quite cold condition; the other curves are for the hot condition. The one labelled 'shortened armature winding' indicates the improvement in output effected by this reduction of resistance, though we do not suggest that the whole difference is entirely due to this cause, as it is a fact that the output performances of apparently identical machines seem to vary quite considerably, as already reported. As will be seen, we have had machines whose performances have not been up to specification, and in the very latest we believe the necessary improvement has been effected. The principal reason for not coming up to specification appears to be variation in flux produced by a given number of ampere turns due to variation of the inaccuracy of the machine (e.g. concentricity of Contd. | ||