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).
Follow-up letter discussing temperature readings, cooling system performance, water loss, and potential remedies for detonations.
| Identifier | ExFiles\Box 14\7\ Scan043 | |
| Date | 9th July 1930 | |
| -2- Hs{Lord Ernest Hives - Chair}/m.S/WL.9.7.30.Contd. We want you to be very careful to make it clear how maximum temperatures which you record in your Daily Reports are obtained. We note in the Daily Report 7.7.30, that you record a difference between average and maximum air temperature of only 3°C., while the difference between maximum and average water temperature is 18°C. We presume that this must be due to a following wind. We want you, as far as possible, to avoid making the cooling system of the car appear to be worse than it is, because we consider that you have got about the most severe conditions possible with atmospheric temperatures of 33°C. on French roads. We should like you to confirm that the difference between running with the cut-out open and cut-out closed is not more than 2°C. R.{Sir Henry Royce} has also expressed a desire to know whether any difference can be detected with the radiator shutters removed from the front of the car, and this is a test you might carry out. We cannot quite understand the water loss. Do you think that water is passing out down the steam pipes, or being lost by evaporation?. It would be worth while confirming that the thermostat does not cause water to splash out down the steam pipes, and also that it does not effect the temperature at which the car runs, i.e. confirm the tests we did here. From your report on detonations it seems possible that the car might keep cooler if the ignition was retarded slightly. | ||