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).
Different mechanisms for operating external car radiator louvres.
| Identifier | ExFiles\Box 39\4\ Scan023 | |
| Date | 13th May 1919 | |
| COPY <s>Ex.</s> from Oy. for Hives. RE LOUVRES 1. I wrote you some time ago that a garage man in New York was fitting Rolls-Royce cars with external louvres. At that time I thought these were adjusted by hand in connection with a thermostat, but I find that they are worked mechanically by a by-pass taken from the oil pressure pipe running alongside the engine, where it joins on to the wheelcase. The oil pressure is turned on or off to operate the louvres by means of a piston through a simple thermostat diaphragm, held on a bracket at the back of the radiator, and heated merely by the hot air coming through the radiator. The arrangement is crude in the extreme in its detail, but is said to be most satisfactory in practice. 2. I hear also that the Sylphon people are making louvres operated direct by a long cylinder of corrugated sylphon tubing, mounted behind the radiator and heated simply by hot air. I thought this would interest Mr. Royce. 3. The direct operation seems good, rather than taking a by-pass from our oil pressure, and the heating of the thermostat by hot air only gets away from the necessity of making a by-pass in the radiator, as Mr. Royce suggested at Chichester. I do not know whether this sylphon scheme is good in practice, but will make inquiries. Oy. | ||