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).
Methods taken to reduce engine boiling by altering radiators and fan blades.
| Identifier | ExFiles\Box 24\5\ Scan083 | |
| Date | 1st July 1925 guessed | |
| -2- alteration of radiators. I should mention, however, that later on when the new models containing certain alterations in the radiators asked for me by arrived, the larger radiators provided got rid to a large extent of this constant boiling. So the following steps which I took in 1915-16 were not so necessary at a later stage. The chief methods taken to reduce the boiling were these: (1) We found that the blades of the fan were in many cases not really efficient in pulling the air through the radiator. We had some experimental fans made in India much on the same lines as the propellers of aeroplanes, and where practicable we increased the size of the blades as much as possible with due regard to their clearance against parts of the chassis. This had a good effect in the trials of 1915 at Murree, but the improvement was only partial. I should also remark that great care was taken in every case to see that the fan belts were properly adjusted and were not loose, thereby allowing slip to take place between the pulley of the crankshaft and that of the fan. (2) In certain experiments made, partly at Thornycrofts Works in England and partly in India, we found that if the surface of the blades of the | ||