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 for a Lucas dynamo compared to an R.R. model for the 25/30 or Bentley car.
| Identifier | ExFiles\Box 168a\3\ img425 | |
| Date | 1st September 1937 | |
| 6442 To WJ. from AC/CAP9 C. Sy/RD. C. RR. AC/CAP.8/LB.1.9.37. LUCAS DYNAMO. Bench tests have now been completed on the dynamo submitted for test by the Lucas Co. 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. | ||