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).
Cracked cylinder head on a Goshawk engine and proposing improvements to the fan drive for better cooling.
| Identifier | WestWitteringFiles\I\May1922\ Scan90 | |
| Date | 24th May 1922 | |
| R.R. 335a. (100 T) (S.H. 728. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3947 To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to CJ. Wor.{Arthur Wormald - General Works Manager} c. to EV.{Ivan Evernden - coachwork} EP.{G. Eric Platford - Chief Quality Engineer} Hs{Lord Ernest Hives - Chair} MAY 25 1922 ORIGINAL RECEIVED R1/M24.5.22. GOSHAWK - CRACKED CYLINDER HEAD. X4225 XL4240 We cannot expect this or any other engine to run with- out water. It is a high duty engine and under the conditions they have been run if it is called upon to run at full throttle very nearly continually, or at continuous long spells. We cannot therefore expect either the valves or head to stand unless there is water to circulate. We must endeavour to make the fan drive more reliable and secondly in the case this is neglected, to prevent as far as possible the rapid loss of water which probably at present takes place in this and most other engines. To render the fan drive more efficient I propose to fit the largest fan possible and to run this as slowly as possible, not attempting to drive it faster than the engine speed. It would therefore be fitted with a pulley the same size as on the engine which will not be larger than the fan pulley on the 40/50, in which case the fan belt should have as easy a time as on the 40/50. In this original arrangement we made the Goshawk crankshaft pulley as small as we could under the circumstances but the fan and it's pulley were both smaller than they need have been, though on examining No.4-Goshawk, one cannot conclude but that the drive is a good one, but the fan is small, and a long way from the radiator. It will be realised also that the fan and radiator have never had the cowling fitted and therefore the fan is too far away from the radiator for it's best efficiency. (1). | ||