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 memorandum discussing various engine cooling system designs, including shutters and cowls.
| Identifier | ExFiles\Box 173\1\ img223 | |
| Date | 6th February 1934 | |
| -6- Another scheme is a governor 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 80°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. SHUTTERS. 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 80°F.{Mr Friese} at 5°C. air). Cadillacs use a size larger thermostat than we do to ger 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 t-1/2" of x is equivalent, adding 5" to matrix depth, 0.5 to 1" on the core depth for a 3" depth radiator core. | ||