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 corrosion tests of sparking plugs and the use of solid aluminium washers.
| Identifier | ExFiles\Box 42\4\ Scan030 | |
| Date | 1st December 1931 guessed | |
| -2- Felixstowe Report No. F/MT/69. in service. The effect of one careful tightening up is shown in Fig.1. In order to continue the corrosion tests of the sparking plugs it was found necessary to provide additional aluminium washers. These were made at this establishment from solid aluminium. A type of solid aluminium washer which has proved to be very effective in practice is shown in Fig.2. The washers are turned from solid aluminium and are grooved on the upper and lower surfaces. A set of these washers has been in use on a Lion V engine in a standard Southampton for a total of 80 hours flying time over a period of four months. During this time the sparking plugs have been refitted 8 times using the same washers and these washers are still in good condition. The general experience suggests that they are more serviceable that standard copper-asbestos washers as they have a longer life and do not close up and grip the threads of the sparking plug. Examples of the washers which have been in use for 80 hours, compared with new washers, are shown in Fig.2. | ||