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).
Implementation and importance of using standardisation sheets for aero engine modifications.
| Identifier | ExFiles\Box 29\2\ Scan235 | |
| Date | 10th February 1930 | |
| To Wor.{Arthur Wormald - General Works Manager} From Hs.{Lord Ernest Hives - Chair} c. to Rg.{Mr Rowledge} By.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} X306 Hs.{Lord Ernest Hives - Chair}1/MJ.10.2.30. X308N AERO ENGINE STANDARDISATION SHEETS; The use of standardisation sheets for aero engine modification is not being rigidly carried out. We admit, the Experimental Dept., are partly to blame for this but as long as it is possible for modifications to get through without a standardisation sheet, there is a likelihood of them being neglected. The standardisation scheme for aero engines is more complicated than for the cars because of the small production and large volume of experimental work. On the other hand, the necessity for agreement before modifications are made, is perhaps more important than on the car because the aero engines having such a high duty can be effected by slight alterations apart from alterations in design. The standardisation sheets should cover alterations in rating of engines or R.P.M. or boost pressures. The recent modification of increasing the maximum permissable revs on the "F" engine from 2500 to 2700 is quite a major alteration although it does not mean any alteration in design. It would appear that the rule should be made that any modification which is fitted to any of our aero engines other than development engines should be covered by a standardisation sheet. We shall have to rely on By.{R.W. Bailey - Chief Engineer} to see that the | ||