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).
Summary of overheating issues, proposing the standardisation of a 5-blade Cadillac fan and discussing a new dashboard thermometer.
| Identifier | ExFiles\Box 155\1\ scan0299 | |
| Date | 24th August 1937 | |
| -5- Rm{William Robotham - Chief Engineer}/Std.G/AR.24.8.37 SUMMARY We think that the 5 blade Cadillac fan tested running at engine speed with an increased size fan belt should be standardised as soon as possible. Such a fan and drive are running on 32-EX. during its next 15,000 miles run in France - if satisfactory we shall immediately issue a standardisation sheet. Meanwhile, we are arranging for a dozen sets of these fans and drives to be available for use in case of repeated complaints of overheating by a customer. With the above fan and the latest standard Mk.VI. matrix we do not think that overheating will be experienced under any conditions - certainly not in this country at any rate. With the existing standard car, the only complaints of overheating which are likely to occur are those of overheating while stationary for long periods in traffic. In such cases, the steam valve should be checked for correct setting (to minimise chance of water loss), the customer should be requested to use his bonnet shutters and the calorstat spring should be removed from the radiator calorstat. If any further complaint of the same trouble on the same car is received, it will be necessary to fit one of the special fans and drives mentioned above. Meanwhile, we are also obtaining a dashboard thermometer from Messrs S. Smith & Sons with a scale which reads up to 90°C. and has no 100°C. mark, but instead a red line corresponding to 105°C. the temperature at which water loss occurs if the steam valve is correctly set. In this way, if the appearance is satisfactory, we hope to use the extra cooling reserve which the steam valve gives us without alarming the owner of the car. At the moment, we know of no better matrix than the Marston Mk.VI. type which is standard at present. Rm{William Robotham - Chief Engineer}/Std. | ||