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).
Tests conducted on the Goshawk engine's cooling system to reduce water loss, with comparisons to the 40/50 model.
| Identifier | WestWitteringFiles\I\May1922\ Scan132 | |
| Date | 30th May 1922 | |
| Contd. -2- Hsl/T30.5.22. different fans, some designed by outside specialists in this class of work, but we found that none of them gave as good results as the type we use on the 40/50. We have also carried out the following tests on the Goshawk to see if we could reduce the loss of water. (1) We arranged an outlet from each end of the cylinder block instead of the front end only. This made no appreciable difference. (2) We arranged in parallel with the present inlet another to supply water to the rear cylinders. This made no difference. (3) We have tried fixing the inlet to the rear three cylinders instead of the front. This made no difference. (4) We have tried to measure the difference in the temperature of the water at different points of the cylinder head when using the standard arrangement of circulation. We have not been able to measure consistently any appreciable difference. (5) We have tried feeding the water from the pump into the rear end cover on the cylinder head, so that the cold water is forced straight along the cylinder head and the cylinder walls would be cooled by convection. We could not appreciate any advantage in this. We have made a test on the bench, running a Goshawk II full load at 1000 R.P.M. with the standard fan, drive and radiator, but no bonnet or undershield. We lose two quarts of water after the engine has boiled continuously for 10 mins. With the fan removed, otherwise running under exactly the same conditions, we lose six quarts of water. None of our tests so far have shown the Goshawk to be any worse than the 40/50 for losing water; so far the results show it to be decidedly better. The fact remains, however, we have had more failures on Goshawk II than we have ever had on the 40/50. | ||