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).
Bench test results comparing a Lucas dynamo with a Rolls-Royce machine for the 25/30 or Bentley car.
| Identifier | ExFiles\Box 142\3\ scan0333 | |
| Date | 7th September 1937 | |
| To Mr. Hy.{Tom Haldenby - Plant Engineer} from RC{R. Childs}/CAPS c.c. Hy{Tom Haldenby - Plant Engineer}/WD.{Mr Wood/Mr Whitehead} c.c. Rm.{William Robotham - Chief Engineer} 1204 RC{R. Childs}/CAP.8/IH.7.9.37. LUCAS DYNAMO. Bench tests have now been completed on the dynamo submitted for test by the Lucas Coy. This is a fan machine, which, generally, has been made to suit the 25/30 or Bentley car. Particulars of this machine are as follows:- | | Lucas. | R.R. | |---|---|---| | Type. | Shunt fitted with fan. | Shunt fitted with fan. | | Yoke dia. | 5.0" | 5.0" | | Weight. | 21lbs. 4ozs. | 23lbs. 7ozs. | | Arm slots. | 23. | 24. | | Brushes. | EG.3. | EG.0. | The features of the odd number of slots, and the hard grade (EG.3) of brush, are in some respects, advantageous; but both tend to make the machine noisy. They have not, therefore, been adopted in the R.R. machine, where quietness has been considered an important point. The tests carried out were in respect of:- (1) Low-speed heating. (2) Output performance. (3) Commutation and noise. (4) Endurance. In each case the results obtained, are directly compared with the corresponding results for the small R.R. machine, on the same test. | ||