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).
Vehicle testing regarding an inefficient cooling fan causing water to boil, and the repair of a failed C.A.V. dynamo.
| Identifier | ExFiles\Box 46\2\ Scan320 | |
| Date | 2nd June 1922 guessed | |
| -2- Contd. registered on the aneroid. Later in the day we had a violent thunderstorm with very heavy rain and toward evening after the rain we went out again in the cool air and repeated the test to see if the air temperature made a difference, but there was very little difference in the results, the water just beginning to boil at the 2 mile mark and the loss of water being 7 pints. The starting temperature on this occasion was about 70°C. The wind was a following one during both tests. The fan belt was tight. The fan itself is a very feeble one and appeared to be almost useless under the circumstances. It is very small and is a long way from the radiator. I presume it is fixed a long way from the radiator to allow for shutters or cowling to be fitted in the final design, but to use it as it is now makes it very inefficient. If you have a better fan or some cowling, I should be glad to have same sent here to try. Meanwhile I have bought a piece of aluminium sheet and propose to make some broader and longer fan blades and rivet them on to the existing blades to see if we can make the fan move more air and prevent the water boiling under the circumstances mentioned. We have just taken to pieces the C.A.V. dynamo which failed and there does not appear to be much wrong with it except the frayed wires but the varnish etc has melted and run evidently due to very high temperature. We are now re-assembling the parts after taking up the wires afresh and will test it a little later. Since writing the above we have fixed the dynamo up and find that it works correctly again. Hy.{Tom Haldenby - Plant Engineer} | ||