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).
Instructions for creating Goshawk 11 combustion space models and details on piston modifications for Mr. Royce's inspection.
| Identifier | ExFiles\Box 49\5\ Scan209 | |
| Date | 1st December 1920 | |
| Contd. -2- It was thought also that the mouth of the combustion space might be machined to a depth of about .300". This method of treating the combustion space is different to that specified for the Buzzard, as shewn on LeC.1276. Would you kindly instruct wooden models to be made of Goshawk 11 combustion space, treated in two ways, namely. 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 opinion as to whether they think it advantageous to machine the combustion space all over as on LeC.1276 or machine only parts of the combustion space as described above, which has the advantage 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 contd:- J.H. & S. LTD. (T) (R. {Sir Henry Royce} 'R'.S. 783. 10. 12-20) C. 3865. | ||