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).
Test report on magneto performance, detailing timing, gaps, and endurance for various models.
| Identifier | WestWitteringFiles\I\July1922\ Scan123 | |
| Date | 21th July 1922 | |
| Contd. -5- EPC1/T21.7.22. armature is naturally held by the magnets) as the datum position, we found that in the advanced position of the lever the makes occurred 57.5°, 74.5° and 81.5° before this datum position respectively for the ZR.6, E06c and EL0.6. The three ranges as set by the makers we found to be 36°, 33° and 62° respectively, so that in the retarded position the three makes occurred at 21.5°, 42° and 19° before this datum position respectively. The breaks occurred as follows :- Advanced 99° 84° and 78° after datum. Retarded 135°,116.5° and 139° after datum. The periods of make respectively are therefore 156.5°, 158.5° and 159.5°. We found the above gaps and timing to be immaterially altered after our tests and the timing to be little affected by varying the platinum gap ± .004". There was, however, a slight reduction in the make ratio of the ELO.6 as the result of running tests with a consequent alteration of a few degrees in the timing. (7) An endurance test was not carried out on the ZR.6, being considered to have been done on the previous ZR.6 machine (See report EFC4/T3.2.21). The endurance test consists of a 12 hour run at 2000 R.P.M. sparking on a set of six 5.5 mm. gaps with timing lever central. On the E06c magneto sparking was irregular | ||