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).
Lucas E.S.R.R. (S.F.) dynamo for the Goshawk engine, detailing its specifications and a noise issue.
| Identifier | WestWitteringFiles\G\October1921\ Scan24 | |
| Date | 27th October 1931 | |
| To R.{Sir Henry Royce} from RFC. c. to CJ. & PH. c. to By.{R.W. Bailey - Chief Engineer} & KP. c. to Rg.{Mr Rowledge} & Da.{Bernard Day - Chassis Design} c. to R.R. of America Inc. ORIGINAL X.4359L - LUCAS E.S.R.R. (S.F.) DYNAMO FOR "GOSHAWK" The weight of this second machine for Goshawk, e.g. 25¼ lbs, is practically identical with the previous machine which is 26 lbs. The resistance of the field circuit cold (18ºC) is 2.85 ohms. The armature appears to be identical with that of the other machine. In other respects also, the particulars of this machine are the same as those of the previous one. The arrangement of the bakelite terminal board on the dynamo is suited to the Lucas style of control. It appears that Messrs. Lucas have merely adapted this machine for the single field winding control, as at present only one of the terminals on the board is connected up, the other connections have to be taken direct from the brushes. We must take up this point with Messrs. Lucas' as to what they propose to do about the arrangement of the terminals, should we adopt this machine. We are not quite happy about the noise of this machine. At first we thought this would not be very much in evidence on the car, but now we have experienced the fact that the Rotax dynamo at present fitted to the car is setting up a disagreeable magnetic hum, which appears to have got worse since the machine was first put on the car. Therefore, contd... | ||