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).
Engine component design and manufacturing choices for the 'Buzzard' project, page 2.
| Identifier | WestWitteringFiles\F\May1921\ Scan23 | |
| Date | 1st May 1921 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -2- E4/G13/5/21 Contd. as described above, and as shewn for the "Buzzard" on LeC.1276, for Mr. Royce's inspection. Needless to say the models should be made as quickly as possible. The volumes should be measured in each case from the model, but there should not be much difference. It would be as well for the Works to express an opin-ion as to whether they think it advantageous to machine the combustion space all over as on LeC.1276 or machine only part of the combustion space as described above, which has the advan-tage of giving rather more freedom for the flow of gases round the valves. The models should demonstrate the exact value of this latter point. Returning again to the piston, the piston pin has been fitted with a taper aluminium plug in its bore at each end, the two plugs being secured by a tube having its ends swaged out. Mr. Royce has suggested the aluminium plugs with a view to preventing the difference in diameter between the piston and the pin becoming so marked with increase in temperature. He does not care whether the piston and pin are put together hot or cold. The piston pin is a floating one, that is, free to turn round and is retained in position endways by the steel band shewn. The connecting rod given on the drawing is of the type which is panel-milled on the stem but otherwise left black, except for the necessary machining at each end. With this type of rod plenty of metal can be left on the inside of the 'I' section when stamping. It is understood that the Works also wish to try doing away with the panel-milling by re-heating and using finishing dies on the drop forging. A decision would be helped if the (Contd.) | ||