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).
Sensitivity of the 'New Phantom' radiator shutter control and proposing a modification.
| Identifier | ExFiles\Box 66a\4\ scan0105 | |
| Date | 7th October 1925 | |
| COPY. BJ. CWB24/LH{Mr Haworth}7.10.25. "NEW PHANTOMCodename for PHANTOM I" RADIATOR SHUTTER CONTROL. This control is very sensitive. In practice, the whole useful range is three notches out of the total number provided. That is to say, if the engine is practically boiling with the control in one notch, the mean temperature will be round about 70º if the shutters are opened two more notches. It would appear that the linkage of the opening mechanism is arranged so that each notch gives an equal angle of rotation to the blades of the radiator shutter. Under these circumstances, the added cooling effect by opening one notch will be very much greater for the early stages of opening than for the later, which has the effect of making the early notches produce much greater differences in the cooling conditions than the later ones. Can it be arranged by means of suitable linkage, that each notch has approximately the same value in altering the cooling conditions? If this could be done, it is felt that the arrangement would not be so sensitive and that far less alteration of the position of the radiator shutters, during running would be required. (Sgd.) CWB. [Illegible circular stamp text, best effort transcription:] (RECEIVED) 6 OCT 1925 HB{C. E. Harcombe} | ||