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).
Scheme for a combined bypass thermostat and shutter control unit for the Phantom III radiator tank.
| Identifier | ExFiles\Box 94\3\ scan0114 | |
| Date | 5th December 1936 | |
| To BY.{R.W. Bailey - Chief Engineer} 340 E/PSN.1/MN.5.12.36. Copy to He. Rm.{William Robotham - Chief Engineer} HPS.{Horace Percy Smith - Experimental Factory Mgr} (crossed out) Da.{Bernard Day - Chassis Design} (crossed out) Rm{William Robotham - Chief Engineer}/Steedman. -------------------- Combined Bye Pass Thermostat and Shutter Control Unit in Top Radiator Tank. Phantom III. We send you herewith LeC.5384 of a scheme for the adaption of the above unit to the existing Phantom III top radiator tank and cylinder head top water rails. The object of this scheme is to reduce mean under bonnet temperatures by arranging that the radiator shutters are at least three quarters open under all operating conditions when once the engine has warmed up. To do this the water temperature is regulated by a bye pass thermostat unit situated in the top radiator tank. The thermostat for operating the radiator shutters is accommodated in the same unit in such a position that it is surrounded by the hot water from the engine. The filling of the thermostat which operates the bye pass is such that the regulating temperature is about 75oC which is the same as at present. The thermostat which operates the shutters is filled with a liquid of 10oC - 15oC lower boiling point so that the shutters start to open at between 60o and 65o and are three quarters open at 75oC. The shutters have been arranged to be three quarters and not fully open at the normal operating temperature for the sake of appearance. A certain amount of experimenting with the bellows and filling liquids will be necessary to produce the desired result. The filling liquids specified on the scheme are those recommended by Messrs.Smiths. The bleed hole into the top tank is shown at .250" diameter but this may require enlarging. A baffle may also be required to prevent loss of water through the steam valve. This point should be investigated. The pattern for the unit should be constructed in such a way that the inlet branches can easily be shortened to accommodate a modified scheme of connections for use with the four port head. This scheme together with a scheme for the water return pipe will be issued later. Att:LeC.5384. E/PSN. | ||