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).
Use of tougher metals and modifications for Goshawk engine cylinder heads to prevent cracking.
| Identifier | WestWitteringFiles\I\June1922\ Scan63 | |
| Date | 9th June 1922 | |
| R.R. 335A. (100 T) (S.H. 788. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2047 To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to CJ. BJ. c. to Wor.{Arthur Wormald - General Works Manager} Pn.{Mr Northey} c. to By.{R.W. Bailey - Chief Engineer} Ep.{G. Eric Platford - Chief Quality Engineer} c. to Hl. [STAMP: Hs{Lord Ernest Hives - Chair} ORIGINAL JUN 1922 REC'D] R3/M9.6.22. X4225 With reference to the material for the cylinder heads on the Goshawk, an investigation should be made to see whether we can cast these in a tougher metal, and so avoid the cracking, even to the extent of going to semi-steel, as we believe were found necessary with the Diesel engine. We are sending you today modifications which should prevent the jacket from cracking so easily through loss of water, and may also in the second modification prevent cracking of the valve faces. Some should be made only with the jacket modified, and some with modifications of both jacket and the web passages. See also other memos. suggesting annealing or ageing these castings to relieve the initial casting stress, and toughen metal. R.{Sir Henry Royce} | ||