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).
Advantages of hard surface liners and comparing different reduction gear types.
| Identifier | ExFiles\Box 179b\1\ img182 | |
| Date | 30th April 1914 | |
| (2) ourselves of one great advantage out of two, that is, we cannot improve upon the expansion, but we can have the hard surface. I say we ought to do this, especially in our new models, the chief reason being that having got rid of the distortion, as we shall do in both the above types, and provided a glass hard surface inside the liners for the pistons to work upon, the reliability of the pistons and rings, and perhaps the oil consumption, will be more favourable and reliable, and as far as I know we suffer no disadvantage. With reference to the reduction gear for the Condor engine, I think that both the double layshaft back gear, and the epicyclic gear of our favourite accelerated type promises to give satisfaction, the great trouble with the double back gear being the equalising of the loads which require some spring connection between the two wheels on each of the layshafts. I think however that the design should be carried forward until one type shews some definite advantage over the other. Personally I have great affection for the accelerated epicyclic type which gives such convenient gears for the ratios at present required. The other points I have treated in my earlier memo. R.{Sir Henry Royce} | ||