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).
The inspection and testing of a new sleeveless Watford magneto and an up-to-date Lucas ER6 magneto.
| Identifier | ExFiles\Box 40\2\ Scan202 | |
| Date | 11th June 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Wor.{Arthur Wormald - General Works Manager} c. HY.{Tom Haldenby - Plant Engineer} Mx.{John H Maddocks - Chief Proving Officer} c. EP.{G. Eric Platford - Chief Quality Engineer} RG.{Mr Rowledge} X8793 (EFC. absent) EFCl/T13.6.27. Dict. 11.6.27. X.430. MAGNETOS. NEW SLEEVELESS TYPE WATFORD MAGNETO NO.98201. X7791 X8790 UP-TO-DATE LUCAS TYPE ER6 MAGNETO NO.53. X8793 We have recently received the first model of the new sleeveless type Watford magneto, and this has been put through our customary bench tests. As reported in our EFCl/T19.5.27, we have also recently received a right up-to-date Lucas type ER6 magneto and this has been put through the tests in parallel with the Watford non-sleeve type. The results of inspection and test of both machines are included in this report. (1) Weight. Watford sleeveless type. - 13.625 lbs.wt. Lucas ER6. 13.31 lbs.wt. For comparison with our present standard, the weight of this is 13.500 lbs. (2) General remarks re mechanical and electrical design. Watford sleeveless type magneto. The external appearance of this magneto is almost precisely the same as the present standard Watford, the only changes in design besides the new armature and the omission of the sleeves being as follows :- (1) Stepped pole pieces of very large angular embrace, which give one the impression that there must be a considerable amount of flux leakage, the gap between the pole tips being only about .150". (2) Bakelite distributor gear wheel. This no doubt is conducive to quietness but will require long tests to prove reliability. Contd. | ||