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).
Page 3 of a report detailing the results of a 200-hour endurance test on a magneto, including observations on performance and component wear.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan210 | |
| Date | 1st December 1929 | |
| -3- EFC1/AM6.12.29 contd. speed good but also the leak performance. The magneto is also now reasonably noiseless in operation, reliable and relatively inexpensive." We have now completed the endurance test referred to in WD.{Mr Wood/Mr Whitehead}89 above, more particularly from the point of view of observation of the tungsten contact points, and my assistant's report WD.{Mr Wood/Mr Whitehead}90. concerning this test reads as follows :- "The magneto was run for 200 hours on our rig at a speed of 2060 r.p.m. with the advance and retard lever set in the central position. This duration corresponds approximately to over 10,000 miles on a 40/50 HP. chassis. Throughout the run no adjustments were made other than cleaning out the carbon dust accumulation in the wipe distributor and oiling. No misfiring was observed, but there was a marked tendency for the safety gap to operate although this gap was set at 8.5 mm. This suggests some kind of ventilation of the space above the armature tunnel where the safety gap is located, especially as the brushing of the live parts produces ozone and causes rusting of the magnet and other ferrous parts. An examination of the contact breaker points at the end of the run shewed their condition to be exceptionally good, the surfaces being even with complete absence of pitting and oxidation. Also the depth of the | ||