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).
Radiator tests comparing performance with shutters open versus in operation at high speeds.
| Identifier | ExFiles\Box 82\1\ scan0254 | |
| Date | 11th October 1933 | |
| X6173- Hotel de France. Chateauroux. Indre. 11.10.33. To Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} From G.W.H. I. B. IV. RE RADIATOR TESTS We have carried out tests with the radiator shutters held fully open and under the same conditions with the shutters in operation. There is a difference of 10°C higher water temperature with the shutters in operation. Shutters held open speed 85-90 M.P.H. Water temperature 75°C constant. Shutters in operation speed 85-90 M.P.H. Water temperature 85°C. There was not sufficient difference in the oil temperature to be noted. [Signature] GWHancock G.W.H. [Handwritten note in red] Rm{William Robotham - Chief Engineer} [Watermark] PERFECT | ||