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).
10,000-mile test of paraffin waxed paper condensers, analysing capacity changes and contact point wear.
| Identifier | ExFiles\Box 165\5\ img036 | |
| Date | 26th January 1931 | |
| WE.76 1/2 X6113. 26.1.31. X.6037. X.6113. PARAFFIN WAXED PAPER CONDENSERS OF REDUCED CAPACITY. One of these condensers has now completed a 10,000 mile test on 20/25 chassis 18-GIV and we have received the condenser and tungsten contact points for examination. The condenser capacity has increased slightly being now .246 mf. at 18°C. the initial measurement being .230 mf. at 20°C. This is opposite to the effect on varnish paper condensers whose capacity generally reduces with age. The condition of the contact points could not be considered to be good in that the wear had been, we consider, excessive. The lever point had worn down 30%. With regard to the surface condition, we consider this to be very good. Oxidation was entirely absent and except for a slight out of register due to the initial setting, the points had beaded all across the surface. The surface condition was very much better from a "pitting" point of view than the latest Delco Remy we have tested. The wear, however, is much more and considered excessive. It appears that we must also make some attempt now at reducing the primary current at break in order to reduce this wear. The lower capacity condenser may have contributed to the effect but if this is so we consider it could be negatived by correspondingly increasing the primary inductance. H.E.W. | ||