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).
Engine cooling, comparing water loss from boiling during test drives in France with a Spanish trials car.
| Identifier | ExFiles\Box 24\5\ Scan090 | |
| Date | 18th June 1925 | |
| -3- BY2/H.18.6.25. ------------ conditions experienced, a trailing or side wind would have caused the jacket water to boil. The experiences of drivers on test cars in France is that they have all boiled during hot weather, and have boiled all the time, have not been filled up only once per day, and amount of water lost has been approx. three quarters of a gallon. There is an enormous difference in heat absorbed by water, and by not boiling, and water turned into steam; the difference is that in the latter case heat absorption is five hundred times the former, hence the apparently disproportionate loss of water experienced, although cars were driven 250 miles with jacket water boiling all the time. The test driving in France confirms results experienced by PN.{Mr Northey} and shows that supposed extraordinary performance of Spanish trials car is only so because no accurate data of his driving conditions are available. Whilst he may not have driven leisurely, he certainly has not driven all out like PN.{Mr Northey} and French drivers. BY.{R.W. Bailey - Chief Engineer} | ||