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).
Technical memo discussing cooling system designs and competitor analysis, including pulleys, fan blades, thermostats and cowls.
| Identifier | ExFiles\Box 149a\3\ scan0102 | |
| Date | 6th February 1934 | |
| -6- Another scheme is a govenor controlled type of Phillipson pulley, (i.e., old type variable motor cycle gear). Ford scheme thermostatically variable blade pitch (at low speeds temperature rises across matrix 40°F.{Mr Friese}, at high speeds 90°F.{Mr Friese}) This is still very experimental. They have been playing with many schemes for a long time. They hate the fan noise as much as we do. Check material of Chrysler fan blades. They should be of a particularly non-resonant material. SHUTTERING. Non-existent except on Cadillac. Only advantage, make intake temperature more constant in cold weather. If we still have the thermostat on the green car we could find out what this is worth, both in inlet temperature and carburetion, (Said to be 85°F.{Mr Friese} at 5°F.{Mr Friese} air). Cadillacs use a size larger thermostat than we do to get precise control. (See drawing). The Harrison people have run into the trouble of wind pressure. Closing the shutters and proved, by trial and error on their dynamometer, they could unbalance the shutters so as to overcome it. COWLS. The new La{L. A. Archer} Salle has a very considerable cowl. This greatly improves radiator efficiency due to elimination of "spill". As a rough figure 5-1/2" of x is equivalent, adding 5" to matrix depth, i.e to 1" on the core depth for a 3" depth radiator core. | ||