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).
Design of engine radiator tubes and water circulation.
| Identifier | ExFiles\Box 66a\4\ scan0286 | |
| Date | 9th September 1929 | |
| To PN.{Mr Northey} from Hs.{Lord Ernest Hives - Chair} c. to Wor.{Arthur Wormald - General Works Manager} Sg.{Arthur F. Sidgreaves - MD} c. to Hm.{Capt. W. Hallam - Head Repairs} H.{Arthur M. Hanbury - Head Complaints} ENGINE COOLING AND WATER CIRCULATION. With reference to PNL/WT10.5.29. The question of water space through the tubes in the radiator is a point which is always considered carefully. When we altered the diameter of the tubes on the first experimental radiator, the space through the tubes was proportionately smaller, but in order to avoid any risk of the water space being too small, the design of the tube was altered so that the space between the tubes is identical to what we have used ever since we have had a honeycomb radiator. The only reduction therefore in the flow of water is that the length of gap between the tubes has been reduced by .500" but at the same time we have increased the number of tubes and therefore the number of water spaces so that the hydraulic resistance in the radiator is approximately the same. We saw the condition of the radiator on Sir Alec Black's car and we are confident that no alteration in the radiator design accounts for that failure. We should expect any radiator to become stopped up if the same quantity of mud (?) got into it. The material of the tubes is the same as we have used since we first had the honeycomb XXX radiator. contd :- | ||