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).
Comparison of the volt-ampere capacities of Lucas ER6, Watford EW6, and E06 magnetos for engine cold starting.
| Identifier | ExFiles\Box 65\3\ scan0233 | |
| Date | 26th March 1928 guessed | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. (5) Customer's No. 19 We do not consider that this is asking for the impossible as MX{John H Maddocks - Chief Proving Officer} has informed us that the Lucas ER6 magnetos which he has personally tested from time to time have been quite OK at starting the engine cold. The Volt-ampere capacities of the armatures of the Lucas and Watford EW6 magnetos at 400 rpm are:- Lucas 7.14 Volt-amperes Watford 5.02 " " Corresponding figures taken on E06 magnetos a considerable time back were 5.43 volt amperes, showing the EW6 magneto to be the lowest of all. Signed H.E.W. This Sheet must be filed on completion of the work. | ||